diff options
Diffstat (limited to 'lib_i386/realmode.c')
| -rw-r--r-- | lib_i386/realmode.c | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/lib_i386/realmode.c b/lib_i386/realmode.c index d7bb81c..6cf2738 100644 --- a/lib_i386/realmode.c +++ b/lib_i386/realmode.c @@ -1,7 +1,7 @@ /* * (C) Copyright 2002 * Daniel Engström, Omicron Ceti AB, daniel@omicron.se - * + * * See file CREDITS for list of people who contributed to this * project. * @@ -37,39 +37,39 @@ int realmode_setup(void) { /* copy the realmode switch code */ if (i386boot_realmode_size > (REALMODE_MAILBOX-REALMODE_BASE)) { - printf("realmode switch too large (%ld bytes, max is %d)\n", + printf("realmode switch too large (%ld bytes, max is %d)\n", i386boot_realmode_size, (REALMODE_MAILBOX-REALMODE_BASE)); return -1; } - + memcpy(REALMODE_BASE, (void*)i386boot_realmode, i386boot_realmode_size); asm("wbinvd\n"); - + return 0; } - + int enter_realmode(u16 seg, u16 off, struct pt_regs *in, struct pt_regs *out) { - + /* setup out thin bios emulation */ if (bios_setup()) { return -1; } - + if (realmode_setup()) { return -1; } - + in->eip = off; in->xcs = seg; if (3>(in->esp & 0xffff)) { printf("Warning: entering realmode with sp < 4 will fail\n"); } - + memcpy(REALMODE_MAILBOX, in, sizeof(struct pt_regs)); asm("wbinvd\n"); - - __asm__ volatile ( + + __asm__ volatile ( "lcall $0x20,%0\n" : : "i" (&realmode_enter) ); asm("wbinvd\n"); @@ -88,9 +88,8 @@ int enter_realmode_int(u8 lvl, struct pt_regs *in, struct pt_regs *out) writeb(lvl, 0x701); writeb(0xcb, 0x702); /* lret */ asm("wbinvd\n"); - - enter_realmode(0x00, 0x700, in, out); - + + enter_realmode(0x00, 0x700, in, out); + return out->eflags&1; } - |