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mirror of https://gitlab.os-k.eu/os-k-team/kvisc.git synced 2023-08-25 14:05:46 +02:00
kvisc/pc/mem.c
julianb0 58ca78f1f1
dos
2019-05-30 19:07:04 +02:00

147 lines
3.6 KiB
C

// The OS/K Team licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include "arch.h"
ulong readmem(ctx_t *ctx, ulong addr, uint len)
{
switch (len) {
case 1: return readmem8(ctx, addr); break;
case 2: return readmem16(ctx, addr); break;
case 4: return readmem32(ctx, addr); break;
case 8: return readmem64(ctx, addr); break;
default: log("readmem() bad length!\n"); abort();
}
}
void writemem(ctx_t *ctx, ulong val, ulong addr, uint len)
{
addr += ctx->r[CR2].val;
switch (len) {
case 1: writemem8(ctx, val, addr); break;
case 2: writemem16(ctx, val, addr); break;
case 4: writemem32(ctx, val, addr); break;
case 8: writemem64(ctx, val, addr); break;
default: log("writemem() bad length!\n"); abort();
}
}
#define CHK_RANGE() \
if (addr < MEMOFF || real >= MEMSIZE) { \
_except(ctx, E_ACC, \
"Invalid MEM access: 0x%012lX (0x%012lX)", addr, real); \
}
#define CHK_ALIGN(type) \
if (addr % alignof(type) > 0) { \
_except(ctx, E_ALI, \
"Non-aligned memory access: 0x%012lX (0x%012lX) by %lu", \
addr, real, alignof(type)); \
}
#define GETREAL() \
addr += ctx->r[CR2].val; \
ulong real = addr2real(addr)
ulong readmem8(ctx_t *ctx, ulong addr)
{
GETREAL();
CHK_RANGE();
if (addr % 2 == 0) return (ulong)ctx->mp[real] & 0xFF;
else return ((ulong)ctx->mp[real] & 0xFF00) >> 8;
}
ulong readmem16(ctx_t *ctx, ulong addr)
{
GETREAL();
CHK_RANGE();
CHK_ALIGN(ushort);
return (ulong)ctx->mp[real];
}
ulong readmem32(ctx_t *ctx, ulong addr)
{
GETREAL();
CHK_RANGE();
CHK_ALIGN(uint);
ulong val = ctx->mp[real++];
val = val | ((ulong)ctx->mp[real] << 16);
return val;
}
ulong readmem64(ctx_t *ctx, ulong addr)
{
GETREAL();
CHK_RANGE();
CHK_ALIGN(ulong);
ulong val = (ulong)ctx->mp[real++];
val = val | ((ulong)ctx->mp[real++] << 16);
val = val | ((ulong)ctx->mp[real++] << 32);
val = val | ((ulong)ctx->mp[real] << 48);
return val;
}
void writemem8(ctx_t *ctx, ulong val, ulong addr)
{
GETREAL();
CHK_RANGE();
ushort v = ctx->mp[real];
if (!(addr % 2)) {
ctx->mp[real] = ((v & 0xFF00) << 8) | (val & 0xFF);
}
else {
ctx->mp[real] = (v & 0xFF) | (((val & 0xFF) << 8));
}
/*
if (addr % 2) {
ctx->mp[real] = (v & 0xFF00) | (val & 0xFF);
}
else {
ctx->mp[real] = (v & 0xFF) | (((val & 0xFF) << 8));
}
*/
}
void writemem16(ctx_t *ctx, ulong val, ulong addr)
{
GETREAL();
CHK_RANGE();
CHK_ALIGN(ushort);
ctx->mp[real] = val & 0xFFFF;
}
void writemem32(ctx_t *ctx, ulong val, ulong addr)
{
GETREAL();
CHK_RANGE();
CHK_ALIGN(uint);
ctx->mp[real++] = val & 0xFFFF;
ctx->mp[real] = (val >> 16) & 0xFFFF;
}
void writemem64(ctx_t *ctx, ulong val, ulong addr)
{
GETREAL();
CHK_RANGE();
CHK_ALIGN(ulong);
ctx->mp[real++] = val;
ctx->mp[real++] = (val >> 16) & 0xFFFF;
ctx->mp[real++] = (val >> 32) & 0xFFFF;
ctx->mp[real] = (val >> 48) & 0xFFFF;
}