claunia/86Box
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Only flush write MMU cache on WP flag toggle as read and execute MMU cache is not affected by the flag.

Browse Source
This commit is contained in:
OBattler
2025-03-23 15:36:05 +01:00
parent c5efce619f
commit 609f34cc49
4 changed files with 28 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/cpu/x86_ops_mov_ctrl.h
View File

@@ -184,7 +184,7 @@ opMOV_CRx_r_a16(uint32_t fetchdat)
fetch_ea_16(fetchdat);
switch (cpu_reg) {
case 0:
if ((cpu_state.regs[cpu_rm].l ^ cr0) & (0x00000001 | WP_FLAG))
if ((cpu_state.regs[cpu_rm].l ^ cr0) & 0x00000001)
flushmmucache();
else if ((cpu_state.regs[cpu_rm].l ^ cr0) & 0x80000000) {
if (is_p6 || cpu_use_dynarec)
@@ -193,7 +193,8 @@ opMOV_CRx_r_a16(uint32_t fetchdat)
flushmmucache_nopc();
cpu_flush_pending = 1;
}
}
} else if ((cpu_state.regs[cpu_rm].l ^ cr0) & WP_FLAG)
flushmmucache_write();
/* Make sure CPL = 0 when switching from real mode to protected mode. */
if ((cpu_state.regs[cpu_rm].l & 0x01) && !(cr0 & 0x01))
cpu_state.seg_cs.access &= 0x9f;
@@ -249,7 +250,7 @@ opMOV_CRx_r_a32(uint32_t fetchdat)
fetch_ea_32(fetchdat);
switch (cpu_reg) {
case 0:
if ((cpu_state.regs[cpu_rm].l ^ cr0) & (0x00000001 | WP_FLAG))
if ((cpu_state.regs[cpu_rm].l ^ cr0) & 0x00000001)
flushmmucache();
else if ((cpu_state.regs[cpu_rm].l ^ cr0) & 0x80000000) {
if (is_p6 || cpu_use_dynarec)
@@ -258,7 +259,8 @@ opMOV_CRx_r_a32(uint32_t fetchdat)
flushmmucache_nopc();
cpu_flush_pending = 1;
}
}
} else if ((cpu_state.regs[cpu_rm].l ^ cr0) & WP_FLAG)
flushmmucache_write();
/* Make sure CPL = 0 when switching from real mode to protected mode. */
if ((cpu_state.regs[cpu_rm].l & 0x01) && !(cr0 & 0x01))
cpu_state.seg_cs.access &= 0x9f;

10
src/cpu/x86_ops_mov_ctrl_2386.h
View File

@@ -180,12 +180,13 @@ opMOV_CRx_r_a16(uint32_t fetchdat)
fetch_ea_16(fetchdat);
switch (cpu_reg) {
case 0:
if ((cpu_state.regs[cpu_rm].l ^ cr0) & (0x00000001 | WP_FLAG))
if ((cpu_state.regs[cpu_rm].l ^ cr0) & 0x00000001)
flushmmucache();
else if ((cpu_state.regs[cpu_rm].l ^ cr0) & 0x80000000) {
flushmmucache_nopc();
cpu_flush_pending = 1;
}
} else if ((cpu_state.regs[cpu_rm].l ^ cr0) & WP_FLAG)
flushmmucache_write();
/* Make sure CPL = 0 when switching from real mode to protected mode. */
if ((cpu_state.regs[cpu_rm].l & 0x01) && !(cr0 & 0x01))
cpu_state.seg_cs.access &= 0x9f;
@@ -241,12 +242,13 @@ opMOV_CRx_r_a32(uint32_t fetchdat)
fetch_ea_32(fetchdat);
switch (cpu_reg) {
case 0:
if ((cpu_state.regs[cpu_rm].l ^ cr0) & (0x00000001 | WP_FLAG))
if ((cpu_state.regs[cpu_rm].l ^ cr0) & 0x00000001)
flushmmucache();
else if ((cpu_state.regs[cpu_rm].l ^ cr0) & 0x80000000) {
flushmmucache_nopc();
cpu_flush_pending = 1;
}
} else if ((cpu_state.regs[cpu_rm].l ^ cr0) & WP_FLAG)
flushmmucache_write();
/* Make sure CPL = 0 when switching from real mode to protected mode. */
if ((cpu_state.regs[cpu_rm].l & 0x01) && !(cr0 & 0x01))
cpu_state.seg_cs.access &= 0x9f;