* 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
diff --git a/lib_i386/realmode.c b/lib_i386/realmode.c
index 27d4693..d7bb81c 100644
--- a/lib_i386/realmode.c
+++ b/lib_i386/realmode.c
@@ -33,7 +33,21 @@
extern char realmode_enter;
-
+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",
+ 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)
{
@@ -41,17 +55,11 @@
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));
+
+ if (realmode_setup()) {
return -1;
}
-
- memcpy(REALMODE_BASE, (void*)i386boot_realmode, i386boot_realmode_size);
-
-
+
in->eip = off;
in->xcs = seg;
if (3>(in->esp & 0xffff)) {
@@ -59,12 +67,30 @@
}
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;
+}
+