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| author | Kevin O'Connor <kevin@koconnor.net> | 2008-11-16 09:17:02 -0500 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2008-11-16 09:17:02 -0500 |
| commit | d9a8b2dfef3eeed05a6f4e958bd327ac9a593b38 (patch) | |
| tree | fe2d6c446ef22c1d0d51b6828d20dd6f9ea12b9f /src/system.c | |
| parent | 8820a10e732c08e5c8224a2f1456a629b9bc5d98 (diff) | |
| download | seabios-d9a8b2dfef3eeed05a6f4e958bd327ac9a593b38.tar.gz | |
Cleanup a20 code.
Fix two apparent bugs - set_a20() returned new status instead of old
status and handle_152402() checked wrong bit.
Add bit definition for the a20 enable bit: A20_ENABLE_BIT
Allow ioport.h #defines to be used in romlayout.S.
Diffstat (limited to 'src/system.c')
| -rw-r--r-- | src/system.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/system.c b/src/system.c index f4e42635..11b1cc8c 100644 --- a/src/system.c +++ b/src/system.c @@ -19,12 +19,12 @@ set_a20(u8 cond) // get current setting first u8 newval, oldval = inb(PORT_A20); if (cond) - newval = oldval | 0x02; + newval = oldval | A20_ENABLE_BIT; else - newval = oldval & ~0x02; + newval = oldval & ~A20_ENABLE_BIT; outb(newval, PORT_A20); - return (newval & 0x02) != 0; + return (oldval & A20_ENABLE_BIT) != 0; } static void @@ -44,7 +44,7 @@ handle_152401(struct bregs *regs) static void handle_152402(struct bregs *regs) { - regs->al = !!(inb(PORT_A20) & 0x20); + regs->al = (inb(PORT_A20) & A20_ENABLE_BIT) != 0; set_code_success(regs); } |