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Subject[PATCH 1/3] Generic acpi vgapost
Generic function to post the video bios.

Based directly on the original patch by Ole Rohne.

Signed-off-by: Michael Marineau <marineam@engr.orst.edu>
--
Michael Marineau
marineam@engr.orst.edu
Oregon State University
Index: linux-2.6.13-rc7/arch/i386/kernel/acpi/sleep.c
===================================================================
--- linux-2.6.13-rc7.orig/arch/i386/kernel/acpi/sleep.c
+++ linux-2.6.13-rc7/arch/i386/kernel/acpi/sleep.c
@@ -5,6 +5,7 @@
* Copyright (C) 2001-2003 Pavel Machek <pavel@suse.cz>
*/

+#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/dmi.h>
@@ -56,6 +57,34 @@ void acpi_restore_state_mem (void)
zap_low_mappings();
}

+/*
+ * acpi_vgapost
+ */
+
+extern void do_vgapost_lowlevel (unsigned long);
+
+void acpi_vgapost (unsigned long slot)
+{
+ unsigned long flags, saved_video_flags = acpi_video_flags;
+
+ acpi_video_flags = (slot & 0xffff) << 16 | 1;
+
+ /* Map low memory and copy information */
+ init_low_mapping(swapper_pg_dir, USER_PTRS_PER_PGD);
+ memcpy((void *) acpi_wakeup_address, &wakeup_start, &wakeup_end - &wakeup_start);
+ acpi_copy_wakeup_routine(acpi_wakeup_address);
+
+ /* Tunnel thru real mode */
+ local_irq_save(flags);
+ do_vgapost_lowlevel(acpi_wakeup_address);
+ local_irq_restore(flags);
+
+ /* Restore mapping etc */
+ zap_low_mappings();
+ acpi_video_flags = saved_video_flags;
+}
+EXPORT_SYMBOL (acpi_vgapost);
+
/**
* acpi_reserve_bootmem - do _very_ early ACPI initialisation
*
Index: linux-2.6.13-rc7/arch/i386/kernel/acpi/wakeup.S
===================================================================
--- linux-2.6.13-rc7.orig/arch/i386/kernel/acpi/wakeup.S
+++ linux-2.6.13-rc7/arch/i386/kernel/acpi/wakeup.S
@@ -171,6 +171,32 @@ check_vesa:

_setbad: jmp setbad

+#
+# Real mode switch - verbatim from reboot.c
+#
+go_real:
+ movl %cr0, %eax
+ andl $0x00000011, %eax
+ orl $0x60000000, %eax
+ movl %eax, %cr0
+ movl %eax, %cr3
+ movl %cr0, %ebx
+ andl $0x60000000, %ebx
+ jz 1f
+ wbinvd
+1: andb $0x10, %al
+ movl %eax, %cr0
+go_real_jmp: .byte 0xea
+go_real_jmp_off: .word 0x0000
+go_real_jmp_seg: .word 0x0000
+#
+# Real mode descriptor table
+#
+ .align 8
+go_real_desc: .quad 0x0000000000000000
+go_real_cseg: .quad 0x00009a000000ffff
+go_real_dseg: .quad 0x000092000000ffff
+
.code32
ALIGN

@@ -310,6 +336,59 @@ ENTRY(do_suspend_lowlevel_s4bios)
call acpi_enter_sleep_state_s4bios
ret

+ENTRY(do_vgapost_lowlevel)
+ # Convert target offset to physical address
+ movl %eax, %ecx
+ subl $__PAGE_OFFSET, %ecx
+ # Fixup GDT pointer
+ movl %ecx, %edx
+ addl $go_real_desc - wakeup_start, %edx
+ movl %edx, go_real_gdt + 2
+ # Fixup 16-bit CS descriptor
+ movl %ecx, %edx
+ movw %dx, go_real_cseg - wakeup_start + 2 (%eax)
+ shrl $16, %edx
+ movb %dl, go_real_cseg - wakeup_start + 4 (%eax)
+ movb %dh, go_real_cseg - wakeup_start + 7 (%eax)
+ # Fixup 16-bit jump
+ movl %ecx, %edx
+ shrl $4, %edx
+ movw %dx, go_real_jmp_seg - wakeup_start (%eax)
+ # Save state and registers
+ call save_processor_state
+ call save_registers
+ # Reload page table with low mapping
+ movl $swapper_pg_dir-__PAGE_OFFSET, %eax
+ movl %eax, %cr3
+ # Load IDTR and GDTR for real mode
+ lidt go_real_idt
+ lgdt go_real_gdt
+ # Load DS & al
+ movl $0x0010, %eax
+ movl %eax, %ss
+ movl %eax, %ds
+ movl %eax, %es
+ movl %eax, %fs
+ movl %eax, %gs
+ # Load CS
+ call $0x0008, $(go_real - wakeup_start)
+ # Phony return code
+ call restore_registers
+ call restore_processor_state
+ ret
+
+ .align 4
+ .word 0
+go_real_idt:
+ .word 0x3ff
+ .long 0
+
+ .align 4
+ .word 0
+go_real_gdt:
+ .word 3*8-1
+ .long 0
+
ALIGN
# saved registers
saved_gdt: .long 0,0[unhandled content-type:application/pgp-signature]
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