fix memory map doc
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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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@ -84,14 +84,14 @@ 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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%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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@ -193,21 +193,22 @@ mem_alloc:
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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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%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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%define .handle word [bp+4]
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push es
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push di
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@ -231,9 +232,9 @@ mem_free:
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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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%undef .handle
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; -----------------------------------------------------------------------------
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; mem_get_size
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@ -241,12 +242,11 @@ 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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%define .handle word [bp+4]
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push es
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push di
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@ -268,9 +268,9 @@ mem_get_size:
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.done:
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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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%undef .handle
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; -----------------------------------------------------------------------------
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; mem_resolve
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@ -279,11 +279,12 @@ mem_get_size:
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; Output: DX:AX = Segment:Offset
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; ES:DI = Segment:Offset (pour utilisation immédiate avec stos/movs)
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; -----------------------------------------------------------------------------
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%define .handle word [bp+4]
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mem_resolve:
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push bp
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mov bp, sp
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mov ax, [bp+4] ; Handle
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mov ax, .handle ; Handle
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mov dx, MEM_HEAP_SEG
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mov es, dx
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mov di, ax ; L'offset est le handle lui-même
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@ -292,3 +293,4 @@ mem_resolve:
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leave
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ret
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%undef .handle
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@ -21,7 +21,7 @@
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; =============================================================================
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; --- Configuration ---
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%define GUI_RAM_SEG 0x1800 ; Segment de données UI (Safe: après Stack, avant Heap)
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%define GUI_RAM_SEG 0x0600 ; Segment de données UI (Safe: après Stack, avant Heap)
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%define GUI_MAX_WIDGETS 32 ; Nombre max de widgets simultanés
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; Dimensions
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@ -94,6 +94,7 @@ struc widget
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alignb 2 ; Alignement mémoire pour performance
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endstruc
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; actuellement 34 octets
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%macro GUI 1-*
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%rep %0 - 1
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