a7d006b637
The new code is based on timestamps, rather than delays. This eliminates the need to update every timer in timer_process(), which cost a non-trivial amount of CPU time on low-end machines. This involved changes to every user of the timer code, so this change almost certainly introduces bugs.
101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
#include <stdio.h>
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#include "ibm.h"
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#include "io.h"
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#include "nvr.h"
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#include "nvr_tc8521.h"
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#include "rtc_tc8521.h"
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#include "pic.h"
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#include "timer.h"
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#include "rtc.h"
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#include "paths.h"
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#include "config.h"
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#include "nmi.h"
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static pc_timer_t nvr_onesec_timer;
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static int nvr_onesec_cnt = 0;
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static void tc8521_onesec(void *p)
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{
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nvr_onesec_cnt++;
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if (nvr_onesec_cnt >= 100)
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{
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tc8521_tick();
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nvr_onesec_cnt = 0;
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}
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timer_advance_u64(&nvr_onesec_timer, 10000 * TIMER_USEC);
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}
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void write_tc8521(uint16_t addr, uint8_t val, void *priv)
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{
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uint8_t page = nvrram[0x0D] & 3;
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addr &= 0x0F;
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if (addr < 0x0D) addr += 16 * page;
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if (addr >= 0x10 && nvrram[addr] != val)
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nvr_dosave = 1;
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nvrram[addr] = val;
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}
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uint8_t read_tc8521(uint16_t addr, void *priv)
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{
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uint8_t page = nvrram[0x0D] & 3;
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addr &= 0x0F;
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if (addr < 0x0D) addr += 16 * page;
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return nvrram[addr];
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}
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void tc8521_loadnvr()
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{
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FILE *f;
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nvrmask=63;
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oldromset=romset;
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switch (romset)
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{
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case ROM_T1000: f = nvrfopen("t1000.nvr", "rb"); break;
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case ROM_T1200: f = nvrfopen("t1200.nvr", "rb"); break;
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default: return;
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}
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if (!f)
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{
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memset(nvrram,0xFF,64);
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nvrram[0x0E] = 0; /* Test register */
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if (!enable_sync)
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{
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memset(nvrram, 0, 16);
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}
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return;
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}
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fread(nvrram,64,1,f);
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if (enable_sync)
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tc8521_internal_sync(nvrram);
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else
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tc8521_internal_set_nvrram(nvrram); /* Update the internal clock state based on the NVR registers. */
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fclose(f);
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}
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void tc8521_savenvr()
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{
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FILE *f;
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switch (oldromset)
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{
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case ROM_T1000: f = nvrfopen("t1000.nvr", "wb"); break;
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case ROM_T1200: f = nvrfopen("t1200.nvr", "wb"); break;
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default: return;
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}
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fwrite(nvrram,64,1,f);
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fclose(f);
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}
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void nvr_tc8521_init()
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{
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io_sethandler(0x2C0, 0x10, read_tc8521, NULL, NULL, write_tc8521, NULL, NULL, NULL);
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timer_add(&nvr_onesec_timer, tc8521_onesec, NULL, 1);
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}
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