diff options
author | wdenk <wdenk> | 2003-05-31 18:35:21 +0000 |
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committer | wdenk <wdenk> | 2003-05-31 18:35:21 +0000 |
commit | 7a8e9bed17d7924a9c5c4699b1f6a3a0359524ed (patch) | |
tree | 5c273df9c5efa7b1b6a4ca88904e48039ef591e8 /lib_i386/realmode.c | |
parent | 3b57fe0a70b903f4db66c558bb9828bc58acf06b (diff) |
* Patch by Marc Singer, 29 May 2003:
Fixed rarp boot method for IA32 and other little-endian CPUs.
* Patch by Marc Singer, 28 May 2003:
Added port I/O commands.
* Patch by Matthew McClintock, 28 May 2003
- cpu/mpc824x/start.S: fix relocation code when booting from RAM
- minor patches for utx8245
* Patch by Daniel Engström, 28 May 2003:
x86 update
* Patch by Dave Ellis, 9 May 2003 + 27 May 2003:
add nand flash support to SXNI855T configuration
fix/extend nand flash support:
- fix 'nand erase' command so does not erase bad blocks
- fix 'nand write' command so does not write to bad blocks
- fix nand_probe() so handles no flash detected properly
- add doc/README.nand
- add .jffs2 and .oob options to nand read/write
- add 'nand bad' command to list bad blocks
- add 'clean' option to 'nand erase' to write JFFS2 clean markers
- make NAND read/write faster
* Patch by Rune Torgersen, 23 May 2003:
Update for MPC8266ADS board
Diffstat (limited to 'lib_i386/realmode.c')
-rw-r--r-- | lib_i386/realmode.c | 44 |
1 files changed, 35 insertions, 9 deletions
diff --git a/lib_i386/realmode.c b/lib_i386/realmode.c index 27d4693825..d7bb81c57f 100644 --- a/lib_i386/realmode.c +++ b/lib_i386/realmode.c @@ -33,25 +33,33 @@ extern char realmode_enter; - -int enter_realmode(u16 seg, u16 off, struct pt_regs *in, struct pt_regs *out) +int realmode_setup(void) { - - /* setup out thin bios emulation */ - if (bios_setup()) { - return -1; - } - /* copy the realmode switch code */ if (i386boot_realmode_size > (REALMODE_MAILBOX-REALMODE_BASE)) { printf("realmode switch too large (%ld bytes, max is %d)\n", - i386boot_realmode_size, (int)(REALMODE_MAILBOX-REALMODE_BASE)); + 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)) { @@ -59,12 +67,30 @@ int enter_realmode(u16 seg, u16 off, struct pt_regs *in, struct pt_regs *out) } memcpy(REALMODE_MAILBOX, in, sizeof(struct pt_regs)); + asm("wbinvd\n"); __asm__ volatile ( "lcall $0x20,%0\n" : : "i" (&realmode_enter) ); + asm("wbinvd\n"); memcpy(out, REALMODE_MAILBOX, sizeof(struct pt_regs)); return out->eax; } + +/* This code is supposed to access a realmode interrupt + * it does currently not work for me */ +int enter_realmode_int(u8 lvl, struct pt_regs *in, struct pt_regs *out) +{ + /* place two instructions at 0x700 */ + writeb(0xcd, 0x700); /* int $lvl */ + writeb(lvl, 0x701); + writeb(0xcb, 0x702); /* lret */ + asm("wbinvd\n"); + + enter_realmode(0x00, 0x700, in, out); + + return out->eflags&1; +} + |