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More work at the Shadow recalc code of the Python

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Divided and documented into multiple macros
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Panagiotis
2021-02-14 11:46:22 +02:00
committed by GitHub
parent 54a36d82b9
commit 41cd6b48f8
1 changed files with 24 additions and 1 deletions
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25
src/chipset/opti5x7.c
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@@ -33,8 +33,31 @@
#include <86box/chipset.h>
/* Shadow RAM */
#define SHADOW_RECALC (((dev->regs[4 + !!(i & 4)] & (1 << (i - (4 * !!(i & 4))) * 2)) ? MEM_READ_INTERNAL : MEM_READ_EXTANY) | ((dev->regs[4 + !!(i & 4)] & (1 << ((i - (4 * !!(i & 4))) * 2 + 1))) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY))
/* Register 4h: C0000-CFFFF range | Register 5h: D0000-DFFFF range */
#define CURRENT_REGISTER dev->regs[4 + !!(i & 4)]
/*
Bits 7-6: xC000-xFFFF
Bits 5-4: x8000-xBFFF
Bits 3-2: x4000-x7FFF
Bits 0-1: x0000-x3FFF
x-y
0 0 Read/Write AT bus
1 0 Read from AT - Write to DRAM
1 1 Read from DRAM - Write to DRAM
0 1 Read from DRAM (write protected)
*/
#define CAN_READ (1 << (i - (4 * !!(i & 4))) * 2)
#define CAN_WRITE (1 << ((i - (4 * !!(i & 4))) * 2 + 1))
#define SHADOW_RECALC (((CURRENT_REGISTER & CAN_READ) ? MEM_READ_INTERNAL : MEM_READ_EXTANY) | ((CURRENT_REGISTER & CAN_WRITE) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY))
/* Recalc the E Segment */
#define SHADOW_E_RECALC (((dev->regs[0x06] & 1) ? MEM_READ_INTERNAL : MEM_READ_EXTANY) | ((dev->regs[0x06] & 2) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY))
/* Recalc the F Segment */
#define SHADOW_F_RECALC (((dev->regs[0x06] & 4) ? MEM_READ_INTERNAL : MEM_READ_EXTANY) | ((dev->regs[0x06] & 8) ? MEM_WRITE_INTERNAL : MEM_WRITE_EXTANY))
typedef struct