Re: [patch] s2ram: kill old debugging junk

From: Rafael J. Wysocki
Date: Thu Aug 16 2007 - 10:12:21 EST

On Thursday, 16 August 2007 11:16, Pavel Machek wrote:
>
> This removes old debugging stuff, that should be no longer
> neccessary. It accessed VGA hardware (which may not be ready at this
> point), and used LEDs at port 80 for debugging.
>
> Signed-off-by: Pavel Machek <pavel@xxxxxxx>

Acked-by: Rafael J. Wysocki <rjw@xxxxxxx>

> diff --git a/arch/i386/kernel/acpi/wakeup.S b/arch/i386/kernel/acpi/wakeup.S
> index ed0a0f2..9cebef7 100644
> --- a/arch/i386/kernel/acpi/wakeup.S
> +++ b/arch/i386/kernel/acpi/wakeup.S
> @@ -11,7 +11,7 @@ # Do we need to deal with A20? It is oka
> #
> # If physical address of wakeup_code is 0x12345, BIOS should call us with
> # cs = 0x1234, eip = 0x05
> -#
> +#
>
> #define BEEP \
> inb $97, %al; \
> @@ -52,7 +52,6 @@ wakeup_code:
> BEEP
> 1:
> mov $(wakeup_stack - wakeup_code), %sp # Private stack is needed for ASUS board
> - movw $0x0e00 + 'S', %fs:(0x12)
>
> pushl $0 # Kill any dangerous flags
> popfl
> @@ -90,9 +89,6 @@ wakeup_code:
> # make sure %cr4 is set correctly (features, etc)
> movl real_save_cr4 - wakeup_code, %eax
> movl %eax, %cr4
> - movw $0xb800, %ax
> - movw %ax,%fs
> - movw $0x0e00 + 'i', %fs:(0x12)
>
> # need a gdt -- use lgdtl to force 32-bit operands, in case
> # the GDT is located past 16 megabytes.
> @@ -102,8 +98,6 @@ wakeup_code:
> movl %eax, %cr0
> jmp 1f
> 1:
> - movw $0x0e00 + 'n', %fs:(0x14)
> -
> movl real_magic - wakeup_code, %eax
> cmpl $0x12345678, %eax
> jne bogus_real_magic
> @@ -122,13 +116,11 @@ real_save_cr4: .long 0
> real_magic: .long 0
> video_mode: .long 0
> realmode_flags: .long 0
> -beep_flags: .long 0
> real_efer_save_restore: .long 0
> real_save_efer_edx: .long 0
> real_save_efer_eax: .long 0
>
> bogus_real_magic:
> - movw $0x0e00 + 'B', %fs:(0x12)
> jmp bogus_real_magic
>
> /* This code uses an extended set of video mode numbers. These include:
> @@ -153,29 +145,9 @@ #define VIDEO_FIRST_V7 0x0900
> # Setting of user mode (AX=mode ID) => CF=success
> mode_set:
> movw %ax, %bx
> -#if 0
> - cmpb $0xff, %ah
> - jz setalias
> -
> - testb $VIDEO_RECALC>>8, %ah
> - jnz _setrec
> -
> - cmpb $VIDEO_FIRST_RESOLUTION>>8, %ah
> - jnc setres
> -
> - cmpb $VIDEO_FIRST_SPECIAL>>8, %ah
> - jz setspc
> -
> - cmpb $VIDEO_FIRST_V7>>8, %ah
> - jz setv7
> -#endif
>
> cmpb $VIDEO_FIRST_VESA>>8, %ah
> jnc check_vesa
> -#if 0
> - orb %ah, %ah
> - jz setmenu
> -#endif
>
> decb %ah
> # jz setbios Add bios modes later
> @@ -215,7 +187,6 @@ wakeup_pmode_return:
> movw %ax, %es
> movw %ax, %fs
> movw %ax, %gs
> - movw $0x0e00 + 'u', 0xb8016
>
> # reload the gdt, as we need the full 32 bit address
> lgdt saved_gdt
> @@ -239,7 +210,6 @@ wakeup_pmode_return:
> jmp *%eax
>
> bogus_magic:
> - movw $0x0e00 + 'B', 0xb8018
> jmp bogus_magic
>
>
> diff --git a/arch/x86_64/kernel/acpi/wakeup.S b/arch/x86_64/kernel/acpi/wakeup.S
> index 13f1480..fd09434 100644
> --- a/arch/x86_64/kernel/acpi/wakeup.S
> +++ b/arch/x86_64/kernel/acpi/wakeup.S
> @@ -41,7 +41,6 @@ wakeup_code:
>
> # Running in *copy* of this code, somewhere in low 1MB.
>
> - movb $0xa1, %al ; outb %al, $0x80
> cli
> cld
> # setup data segment
> @@ -65,11 +64,6 @@ # Running in *copy* of this code, somewh
> cmpl $0x12345678, %eax
> jne bogus_real_magic
>
> - call verify_cpu # Verify the cpu supports long
> - # mode
> - testl %eax, %eax
> - jnz no_longmode
> -
> testl $1, realmode_flags - wakeup_code
> jz 1f
> lcall $0xc000,$3
> @@ -84,12 +78,6 @@ # Running in *copy* of this code, somewh
> call mode_seta
> 1:
>
> - movw $0xb800, %ax
> - movw %ax,%fs
> - movw $0x0e00 + 'L', %fs:(0x10)
> -
> - movb $0xa2, %al ; outb %al, $0x80
> -
> mov %ds, %ax # Find 32bit wakeup_code addr
> movzx %ax, %esi # (Convert %ds:gdt to a liner ptr)
> shll $4, %esi
> @@ -117,14 +105,10 @@ wakeup_32_vector:
> .code32
> wakeup_32:
> # Running in this code, but at low address; paging is not yet turned on.
> - movb $0xa5, %al ; outb %al, $0x80
>
> movl $__KERNEL_DS, %eax
> movl %eax, %ds
>
> - movw $0x0e00 + 'i', %ds:(0xb8012)
> - movb $0xa8, %al ; outb %al, $0x80;
> -
> /*
> * Prepare for entering 64bits mode
> */
> @@ -200,16 +184,11 @@ wakeup_long64:
> */
> lgdt cpu_gdt_descr
>
> - movw $0x0e00 + 'n', %ds:(0xb8014)
> - movb $0xa9, %al ; outb %al, $0x80
> -
> movq saved_magic, %rax
> movq $0x123456789abcdef0, %rdx
> cmpq %rdx, %rax
> jne bogus_64_magic
>
> - movw $0x0e00 + 'u', %ds:(0xb8016)
> -
> nop
> nop
> movw $__KERNEL_DS, %ax
> @@ -220,13 +199,11 @@ wakeup_long64:
> movw %ax, %gs
> movq saved_rsp, %rsp
>
> - movw $0x0e00 + 'x', %ds:(0xb8018)
> movq saved_rbx, %rbx
> movq saved_rdi, %rdi
> movq saved_rsi, %rsi
> movq saved_rbp, %rbp
>
> - movw $0x0e00 + '!', %ds:(0xb801a)
> movq saved_rip, %rax
> jmp *%rax
>
> @@ -256,20 +233,12 @@ realmode_flags: .quad 0
>
> .code16
> bogus_real_magic:
> - movb $0xba,%al ; outb %al,$0x80
> jmp bogus_real_magic
>
> .code64
> bogus_64_magic:
> - movb $0xb3,%al ; outb %al,$0x80
> jmp bogus_64_magic
>
> -.code16
> -no_longmode:
> - movb $0xbc,%al ; outb %al,$0x80
> - jmp no_longmode
> -
> -#include "../verify_cpu.S"
>
> /* This code uses an extended set of video mode numbers. These include:
> * Aliases for standard modes
> @@ -294,29 +263,9 @@ # Setting of user mode (AX=mode ID) => C
> .code16
> mode_seta:
> movw %ax, %bx
> -#if 0
> - cmpb $0xff, %ah
> - jz setalias
> -
> - testb $VIDEO_RECALC>>8, %ah
> - jnz _setrec
> -
> - cmpb $VIDEO_FIRST_RESOLUTION>>8, %ah
> - jnc setres
> -
> - cmpb $VIDEO_FIRST_SPECIAL>>8, %ah
> - jz setspc
> -
> - cmpb $VIDEO_FIRST_V7>>8, %ah
> - jz setv7
> -#endif
>
> cmpb $VIDEO_FIRST_VESA>>8, %ah
> jnc check_vesaa
> -#if 0
> - orb %ah, %ah
> - jz setmenu
> -#endif
>
> decb %ah
> # jz setbios Add bios modes later
>

--
"Premature optimization is the root of all evil." - Donald Knuth
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/