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| author | Kevin O'Connor <kevin@koconnor.net> | 2008-03-09 23:37:04 -0400 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2008-03-09 23:37:04 -0400 |
| commit | 2cdd8b6fb1aced4ec08c5e98705922c27285ddfb (patch) | |
| tree | 3d9a613afe57457f3a945db23ad8913d45ff0c1d | |
| parent | f205f9fdb63f87eafd2328955385eb94e9824c26 (diff) | |
| download | seabios-2cdd8b6fb1aced4ec08c5e98705922c27285ddfb.tar.gz | |
Call to int 1587 shouldn't alter regs->cx.
The asm was setting regs->cx to zero - use a temp variable to avoid that.
| -rw-r--r-- | src/system.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/system.c b/src/system.c index 8c595fc1..7c871008 100644 --- a/src/system.c +++ b/src/system.c @@ -152,6 +152,7 @@ handle_1587(struct bregs *regs) SET_VAR(ES, *(u8 *)(si+0x28+5), 0x93); // access SET_VAR(ES, *(u16*)(si+0x28+6), 0x0000); // base 31:24/reserved/limit 19:16 + u16 count = regs->cx; asm volatile( // Load new descriptor tables "lgdtw %%es:0x8(%%si)\n" @@ -192,7 +193,7 @@ handle_1587(struct bregs *regs) // Restore %ds (from %ss) "movw %%ss, %%ax\n" "movw %%ax, %%ds\n" - : "+c"(regs->cx), "+S"(si) + : "+c"(count), "+S"(si) : : "eax", "di"); // XXX - also clobbers %es set_a20(prev_a20_enable); |