fix memory map doc
This commit is contained in:
Frater
parent
4b62e01e82
commit
24a59171e5
3 changed files with 179 additions and 176 deletions
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@ -11,10 +11,10 @@ The processor starts in Real Mode, addressing 1 MB of memory.
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| **`0x00000`** | **`0x003FF`** | 1 KB | **IVT** (Interrupt Vector Table) | `0x0000` | `memory.asm` |
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| **`0x00400`** | **`0x004FF`** | 256 B | **BDA** (BIOS Data Area) Standard | `0x0040` | `memory.asm` |
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| **`0x00500`** | **`0x005FF`** | ~256 B | **Custom BDA** (Driver Data) | `0x0050` | `memory.asm` |
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| **`0x00600`** | **`0x07FFF`** | 30.5 KB | **Free** (Low Memory) | | |
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| **`0x00600`** | **`0x00AFF`** | 1.25 KB | **GUI RAM** (Widget Allocation) | `0x0060` | `gui/lib.asm` |
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| **`0x00B00`** | **`0x07FFF`** | 29 KB | **Free** (Low Memory) | | |
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| **`0x08000`** | **`0x17FFF`** | 64 KB | **Stack** (Grows downwards) | `0x0800` | `memory.asm` |
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| **`0x18000`** | **`0x18FFF`** | ~4 KB | **GUI RAM** (Widget Allocation) | `0x0A00` | `gui/lib.asm` |
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| **`0x19000`** | **`0x9FBFF`** | 539 KB | **Free** (Conventional RAM) | | |
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| **`0x18000`** | **`0x9FBFF`** | 543 KB | **Free** (Conventional RAM) | | |
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| **`0x9FC00`** | **`0x9FFFF`** | 1 KB | **EBDA** (Extended BIOS Data Area) | `0x9FC0` | `memory.asm` |
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| **`0xA0000`** | **`0xAFFFF`** | 64 KB | **VGA RAM** (Graphics Modes) | `0xA000` | `Hardware` |
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| **`0xB0000`** | **`0xB7FFF`** | 32 KB | **MDA RAM** (Monochrome Text) | `0xB000` | `Hardware` |
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@ -42,8 +42,8 @@ The project separates the standard IBM BDA from its own variables to avoid confl
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#### Stack & GUI RAM
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* **Stack**: Segment `0x0800`, SP `0xFFFE`. Grows downwards from physical address `0x17FFE`.
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* **GUI RAM**: Segment `0x0A00` (Physical `0x0A000`).
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* **Layout**: The GUI RAM sits at the "bottom" of the stack segment's physical range, but since the stack starts at the top (`0x17FFE`) and grows down, there is approximately **56 KB** of safe space before collision.
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* **GUI RAM**: Segment `0x0060` (Physical `0x00600`).
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* **Layout**: Located in low memory (`0x00600`) to avoid any collision with the Stack (`0x08000`).
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#### Video RAM (CGA High-Res)
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* **Segment**: `0xB800`
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@ -73,10 +73,10 @@ Le processeur démarre en mode réel, adressant 1 Mo de mémoire.
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| **`0x00000`** | **`0x003FF`** | 1 Ko | **IVT** (Interrupt Vector Table) | `0x0000` | `memory.asm` |
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| **`0x00400`** | **`0x004FF`** | 256 o | **BDA** (BIOS Data Area) Standard | `0x0040` | `memory.asm` |
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| **`0x00500`** | **`0x005FF`** | ~256 o | **Custom BDA** (Données Drivers) | `0x0050` | `memory.asm` |
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| **`0x00600`** | **`0x07FFF`** | 30.5 Ko | **Libre** (Mémoire Basse) | | |
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| **`0x08000`** | **`0x17FFF`** | 64 KB | **Stack** (Grows downwards) | `0x0800` | `memory.asm` |
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| **`0x18000`** | **`0x18FFF`** | ~4 KB | **GUI RAM** (Widget Allocation) | `0x0A00` | `gui/lib.asm` |
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| **`0x19000`** | **`0x9FBFF`** | 539 Ko | **Libre** (RAM Conventionnelle) | | |
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| **`0x00600`** | **`0x00AFF`** | 1.25 Ko | **GUI RAM** (Allocation Widgets) | `0x0060` | `gui/lib.asm` |
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| **`0x00B00`** | **`0x07FFF`** | 29 Ko | **Libre** (Mémoire Basse) | | |
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| **`0x08000`** | **`0x17FFF`** | 64 Ko | **Pile** (Stack) | `0x0800` | `memory.asm` |
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| **`0x18000`** | **`0x9FBFF`** | 543 Ko | **Libre** (RAM Conventionnelle) | | |
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| **`0x9FC00`** | **`0x9FFFF`** | 1 Ko | **EBDA** (Extended BIOS Data Area) | `0x9FC0` | `memory.asm` |
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| **`0xA0000`** | **`0xAFFFF`** | 64 Ko | **VGA RAM** (Modes Graphiques) | `0xA000` | `Matériel` |
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| **`0xB0000`** | **`0xB7FFF`** | 32 Ko | **MDA RAM** (Texte Monochrome) | `0xB000` | `Matériel` |
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@ -104,8 +104,8 @@ Le projet sépare la BDA standard IBM de ses propres variables pour éviter les
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#### Stack & GUI RAM
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* **Stack** : Segment `0x0800`, SP `0xFFFE`. Grandit vers le bas depuis l'adresse physique `0x17FFE`.
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* **GUI RAM** : Segment `0x0A00` (Physique `0x0A000`).
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* **Organisation** : La RAM GUI se trouve "en bas" de la plage physique du segment de pile, mais comme la pile commence tout en haut (`0x17FFE`) et descend, il y a environ **56 Ko** d'espace libre avant collision.
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* **GUI RAM** : Segment `0x0060` (Physique `0x00600`).
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* **Organisation** : Située en mémoire basse (`0x00600`) pour éviter toute collision avec la Pile (`0x08000`).
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#### Video RAM (CGA High-Res)
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* **Segment** : `0xB800`
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@ -27,25 +27,25 @@
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; --- Macro API ---
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; Usage: MEM FUNCTION, [ARG1], [ARG2]...
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%macro MEM 1-*
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%rep %0 - 1
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%rotate -1
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push %1
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%endrep
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%rotate -1
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call word [cs:mem_api_table + ((%1)*2)]
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add sp, (%0 - 1) * 2
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%rep %0 - 1
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%rotate -1
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push %1
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%endrep
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%rotate -1
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call word [cs:mem_api_table + ((%1)*2)]
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add sp, (%0 - 1) * 2
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%endmacro
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mem_api_table:
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dw mem_alloc
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dw mem_get_size
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dw mem_free
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dw mem_resolve
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dw mem_alloc
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dw mem_get_size
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dw mem_free
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dw mem_resolve
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struc mem_block
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.status resb 1 ; État du bloc (0=Libre, 1=Occupé)
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.size resw 1 ; Taille des données (sans le header)
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.next resw 1 ; Offset du prochain bloc (0 = Fin)
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.status resb 1 ; État du bloc (0=Libre, 1=Occupé)
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.size resw 1 ; Taille des données (sans le header)
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.next resw 1 ; Offset du prochain bloc (0 = Fin)
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endstruc
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; -----------------------------------------------------------------------------
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@ -54,28 +54,28 @@ endstruc
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; Crée un seul gros bloc libre couvrant tout le segment.
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; -----------------------------------------------------------------------------
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mem_init:
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push ax
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push es
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push di
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push ax
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push es
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push di
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mov ax, MEM_HEAP_SEG
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mov es, ax
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xor di, di
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mov ax, MEM_HEAP_SEG
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mov es, ax
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xor di, di
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; Initialisation du premier bloc (Header)
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mov byte [es:di + mem_block.status], MEM_STATUS_FREE
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; Initialisation du premier bloc (Header)
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mov byte [es:di + mem_block.status], MEM_STATUS_FREE
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; Taille disponible = Total - TailleHeader
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mov ax, MEM_HEAP_SIZE
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sub ax, mem_block_size
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mov word [es:di + mem_block.size], ax
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; Taille disponible = Total - TailleHeader
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mov ax, MEM_HEAP_SIZE
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sub ax, mem_block_size
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mov word [es:di + mem_block.size], ax
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mov word [es:di + mem_block.next], 0
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mov word [es:di + mem_block.next], 0
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pop di
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pop es
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pop ax
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ret
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pop di
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pop es
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pop ax
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ret
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; -----------------------------------------------------------------------------
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; mem_alloc
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@ -84,156 +84,157 @@ mem_init:
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; Stack: [BP+4] = Taille demandée (word)
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; Output: AX = Handle (Offset du bloc de données) ou 0 si échec
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; -----------------------------------------------------------------------------
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%define .size_requested word [bp+4]
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; variables
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%define .curr_ptr word [bp-2]
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mem_alloc:
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push bp
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mov bp, sp
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sub sp, 2
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push bp
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mov bp, sp
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sub sp, 2
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%define .curr_ptr word [bp-2]
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%define .size_requested word [bp+4]
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push bx
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push cx
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push es
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push di
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push bx
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push cx
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push es
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push di
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mov .curr_ptr, 0 ; On commence la recherche à l'offset 0
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mov .curr_ptr, 0 ; On commence la recherche à l'offset 0
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mov ax, MEM_HEAP_SEG
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mov es, ax
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mov ax, MEM_HEAP_SEG
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mov es, ax
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.scan_loop:
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mov di, .curr_ptr ; DI = Ptr courant
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mov di, .curr_ptr ; DI = Ptr courant
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; 1. Le bloc est-il LIBRE ?
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cmp byte [es:di + mem_block.status], MEM_STATUS_FREE
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jne .next_block
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; 1. Le bloc est-il LIBRE ?
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cmp byte [es:di + mem_block.status], MEM_STATUS_FREE
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jne .next_block
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; 2. Tentative de FUSION (Coalescing) avec les blocs suivants
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; 2. Tentative de FUSION (Coalescing) avec les blocs suivants
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.try_merge:
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mov bx, [es:di + mem_block.next]
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cmp bx, 0
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je .check_size ; Pas de suivant, on vérifie la taille
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mov bx, [es:di + mem_block.next]
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cmp bx, 0
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je .check_size ; Pas de suivant, on vérifie la taille
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; Si le suivant est aussi libre, on fusionne
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cmp byte [es:bx + mem_block.status], MEM_STATUS_FREE
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jne .check_size
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; Si le suivant est aussi libre, on fusionne
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cmp byte [es:bx + mem_block.status], MEM_STATUS_FREE
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jne .check_size
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; Nouvelle Taille = TailleActuelle + Header + TailleSuivant
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mov ax, [es:bx + mem_block.size]
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add ax, mem_block_size
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add [es:di + mem_block.size], ax
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; Nouvelle Taille = TailleActuelle + Header + TailleSuivant
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mov ax, [es:bx + mem_block.size]
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add ax, mem_block_size
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add [es:di + mem_block.size], ax
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; Mise à jour du chainage (saute le bloc fusionné)
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mov ax, [es:bx + mem_block.next]
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mov [es:di + mem_block.next], ax
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; Mise à jour du chainage (saute le bloc fusionné)
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mov ax, [es:bx + mem_block.next]
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mov [es:di + mem_block.next], ax
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jmp .try_merge ; On boucle pour voir si le suivant du suivant est libre
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jmp .try_merge ; On boucle pour voir si le suivant du suivant est libre
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.check_size:
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; 3. Vérifier si la taille est suffisante
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mov ax, .size_requested ; Taille demandée (Argument)
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cmp [es:di + mem_block.size], ax
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jb .next_block ; Trop petit
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; 3. Vérifier si la taille est suffisante
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mov ax, .size_requested ; Taille demandée (Argument)
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cmp [es:di + mem_block.size], ax
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jb .next_block ; Trop petit
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; 4. Allocation (Split si possible)
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; Calculer l'espace restant
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mov cx, [es:di + mem_block.size]
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sub cx, ax ; CX = Reste
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; 4. Allocation (Split si possible)
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; Calculer l'espace restant
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mov cx, [es:di + mem_block.size]
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sub cx, ax ; CX = Reste
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; Peut-on créer un nouveau bloc dans le reste ? (Header + au moins 1 octet)
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cmp cx, mem_block_size + 1
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jb .allocate_full
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; Peut-on créer un nouveau bloc dans le reste ? (Header + au moins 1 octet)
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cmp cx, mem_block_size + 1
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jb .allocate_full
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; --- SPLIT ---
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; Marquer le bloc actuel comme utilisé avec la taille demandée
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mov byte [es:di + mem_block.status], MEM_STATUS_USED
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mov [es:di + mem_block.size], ax
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; --- SPLIT ---
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; Marquer le bloc actuel comme utilisé avec la taille demandée
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mov byte [es:di + mem_block.status], MEM_STATUS_USED
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mov [es:di + mem_block.size], ax
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; Créer le nouveau header dans l'espace restant
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mov bx, di
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add bx, mem_block_size
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add bx, ax ; BX = Offset du nouveau bloc
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; Créer le nouveau header dans l'espace restant
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mov bx, di
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add bx, mem_block_size
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add bx, ax ; BX = Offset du nouveau bloc
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mov byte [es:bx + mem_block.status], MEM_STATUS_FREE
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mov byte [es:bx + mem_block.status], MEM_STATUS_FREE
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sub cx, mem_block_size ; Taille utile du nouveau bloc
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mov [es:bx + mem_block.size], cx
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sub cx, mem_block_size ; Taille utile du nouveau bloc
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mov [es:bx + mem_block.size], cx
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; Insérer dans la liste chainée
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mov dx, [es:di + mem_block.next]
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mov [es:bx + mem_block.next], dx
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mov [es:di + mem_block.next], bx
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; Insérer dans la liste chainée
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mov dx, [es:di + mem_block.next]
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mov [es:bx + mem_block.next], dx
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mov [es:di + mem_block.next], bx
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jmp .success
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jmp .success
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.allocate_full:
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; On prend tout le bloc sans le couper
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mov byte [es:di + mem_block.status], MEM_STATUS_USED
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; On prend tout le bloc sans le couper
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mov byte [es:di + mem_block.status], MEM_STATUS_USED
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.success:
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; Retourner le handle (Offset des DONNÉES = DI + Header)
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mov ax, di
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add ax, mem_block_size
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jmp .done
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; Retourner le handle (Offset des DONNÉES = DI + Header)
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mov ax, di
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add ax, mem_block_size
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jmp .done
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.next_block:
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; Passer au bloc suivant
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mov di, .curr_ptr
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mov ax, [es:di + mem_block.next]
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mov .curr_ptr, ax
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cmp ax, 0
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jne .scan_loop
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; Passer au bloc suivant
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mov di, .curr_ptr
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mov ax, [es:di + mem_block.next]
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mov .curr_ptr, ax
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cmp ax, 0
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jne .scan_loop
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; Échec : Plus de mémoire ou fragmentation trop élevée
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xor ax, ax
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; Échec : Plus de mémoire ou fragmentation trop élevée
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xor ax, ax
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.done:
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pop di
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pop es
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pop cx
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pop bx
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%undef .curr_ptr
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%undef .size_requested
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leave ; Restaure SP et BP
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ret
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pop di
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pop es
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pop cx
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pop bx
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leave ; Restaure SP et BP
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ret
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%undef .curr_ptr
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%undef .size_requested
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; -----------------------------------------------------------------------------
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; mem_free
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; Libère un bloc mémoire.
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; Stack: [BP+4] = Handle (word)
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; -----------------------------------------------------------------------------
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%define .handle word [bp+4]
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mem_free:
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push bp
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mov bp, sp
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push bp
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mov bp, sp
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%define .handle word [bp+4]
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push es
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push di
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push bx
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mov ax, .handle ; Handle
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test ax, ax
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jz .done ; Sécurité Handle NULL
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push es
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push di
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push bx
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mov bx, MEM_HEAP_SEG
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mov es, bx
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mov ax, .handle ; Handle
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test ax, ax
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jz .done ; Sécurité Handle NULL
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; Retrouver le header (Handle - HeaderSize)
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mov di, ax
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sub di, mem_block_size
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mov bx, MEM_HEAP_SEG
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mov es, bx
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; Marquer simplement comme libre (le coalescing se fera au prochain alloc)
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mov byte [es:di + mem_block.status], MEM_STATUS_FREE
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; Retrouver le header (Handle - HeaderSize)
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mov di, ax
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sub di, mem_block_size
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; Marquer simplement comme libre (le coalescing se fera au prochain alloc)
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mov byte [es:di + mem_block.status], MEM_STATUS_FREE
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.done:
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pop bx
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pop di
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pop es
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%undef .handle
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leave
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ret
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pop bx
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pop di
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pop es
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leave
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ret
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%undef .handle
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; -----------------------------------------------------------------------------
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; mem_get_size
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@ -241,36 +242,35 @@ mem_free:
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; Stack: [BP+4] = Handle (word)
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; Output: AX = Taille
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; -----------------------------------------------------------------------------
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%define .handle word [bp+4]
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mem_get_size:
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push bp
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mov bp, sp
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push bp
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mov bp, sp
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%define .handle word [bp+4]
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push es
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push di
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push es
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push di
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mov ax, .handle ; Handle
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test ax, ax
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jz .error
|
||||
|
||||
mov ax, .handle ; Handle
|
||||
test ax, ax
|
||||
jz .error
|
||||
mov bx, MEM_HEAP_SEG
|
||||
mov es, bx
|
||||
|
||||
mov bx, MEM_HEAP_SEG
|
||||
mov es, bx
|
||||
mov di, ax
|
||||
sub di, mem_block_size
|
||||
|
||||
mov di, ax
|
||||
sub di, mem_block_size
|
||||
|
||||
mov ax, [es:di + mem_block.size]
|
||||
jmp .done
|
||||
mov ax, [es:di + mem_block.size]
|
||||
jmp .done
|
||||
|
||||
.error:
|
||||
xor ax, ax
|
||||
xor ax, ax
|
||||
.done:
|
||||
pop di
|
||||
pop es
|
||||
%undef .handle
|
||||
leave
|
||||
ret
|
||||
pop di
|
||||
pop es
|
||||
leave
|
||||
ret
|
||||
%undef .handle
|
||||
|
||||
; -----------------------------------------------------------------------------
|
||||
; mem_resolve
|
||||
|
|
@ -279,16 +279,18 @@ mem_get_size:
|
|||
; Output: DX:AX = Segment:Offset
|
||||
; ES:DI = Segment:Offset (pour utilisation immédiate avec stos/movs)
|
||||
; -----------------------------------------------------------------------------
|
||||
%define .handle word [bp+4]
|
||||
mem_resolve:
|
||||
push bp
|
||||
mov bp, sp
|
||||
push bp
|
||||
mov bp, sp
|
||||
|
||||
mov ax, [bp+4] ; Handle
|
||||
mov dx, MEM_HEAP_SEG
|
||||
mov es, dx
|
||||
mov di, ax ; L'offset est le handle lui-même
|
||||
mov ax, .handle ; Handle
|
||||
mov dx, MEM_HEAP_SEG
|
||||
mov es, dx
|
||||
mov di, ax ; L'offset est le handle lui-même
|
||||
|
||||
; DX contient déjà le segment, AX contient déjà l'offset
|
||||
; DX contient déjà le segment, AX contient déjà l'offset
|
||||
|
||||
leave
|
||||
ret
|
||||
leave
|
||||
ret
|
||||
%undef .handle
|
||||
|
|
@ -21,7 +21,7 @@
|
|||
; =============================================================================
|
||||
|
||||
; --- Configuration ---
|
||||
%define GUI_RAM_SEG 0x1800 ; Segment de données UI (Safe: après Stack, avant Heap)
|
||||
%define GUI_RAM_SEG 0x0600 ; Segment de données UI (Safe: après Stack, avant Heap)
|
||||
%define GUI_MAX_WIDGETS 32 ; Nombre max de widgets simultanés
|
||||
|
||||
; Dimensions
|
||||
|
|
@ -94,6 +94,7 @@ struc widget
|
|||
|
||||
alignb 2 ; Alignement mémoire pour performance
|
||||
endstruc
|
||||
; actuellement 34 octets
|
||||
|
||||
%macro GUI 1-*
|
||||
%rep %0 - 1
|
||||
|
|
|
|||
Loading…
Reference in a new issue