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Allow interrupting of non flag changing string operations.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@969
This commit is contained in:
Sjoerd van der Berg 2003-04-27 11:44:47 +00:00
parent 1f6f136720
commit 47228f94b6
1 changed files with 14 additions and 2 deletions
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16
src/cpu/core_full/string.h
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@ -2,7 +2,7 @@
EAPoint si_base,di_base;
Bitu si_index,di_index;
Bitu add_mask;
Bitu count,count_max;
Bitu count,count_left;
Bits add_index;
bool restart=false;
@ -22,8 +22,19 @@
}
if (!(inst.prefix & PREFIX_REP)) {
count=1;
} else {
/* Calculate amount of ops to do before cycles run out */
if ((count>CPU_Cycles) && (inst.code.op<R_SCASB)) {
count_left=count-CPU_Cycles;
count=CPU_Cycles;
CPU_Cycles=0;
IPPoint=inst.start; //Reset IP to start of instruction
} else {
/* Won't interrupt scas and cmps instruction since they can interrupt themselves */
count_left=0;
CPU_Cycles-=count;
}
}
add_index=GETFLAG(DF) ? -1 : 1;
if (count) switch (inst.code.op) {
case R_OUTSB:
@ -192,6 +203,7 @@
reg_edi&=(~add_mask);
reg_edi|=(di_index & add_mask);
if (inst.prefix & PREFIX_REP) {
count+=count_left;
reg_ecx&=(~add_mask);
reg_ecx|=(count & add_mask);
}