x86, trampoline: Use the unified trampoline setup for ACPI wakeup
Use the unified trampoline allocation setup to allocate and install the ACPI wakeup code in low memory. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> LKML-Reference: <4D5DFBE4.7090104@intel.com> Cc: Rafael J. Wysocki <rjw@sisk.pl> Cc: Matthieu Castet <castet.matthieu@free.fr> Cc: Stephen Rothwell <sfr@canb.auug.org.au>
This commit is contained in:
H. Peter Anvin
parent
4822b7fc6d
commit
d1ee433539
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@ -29,6 +29,7 @@
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#include <asm/processor.h>
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#include <asm/mmu.h>
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#include <asm/mpspec.h>
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#include <asm/trampoline.h>
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#define COMPILER_DEPENDENT_INT64 long long
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#define COMPILER_DEPENDENT_UINT64 unsigned long long
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@ -116,7 +117,8 @@ static inline void acpi_disable_pci(void)
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extern int acpi_save_state_mem(void);
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extern void acpi_restore_state_mem(void);
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extern unsigned long acpi_wakeup_address;
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extern const unsigned char acpi_wakeup_code[];
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#define acpi_wakeup_address (__pa(TRAMPOLINE_SYM(acpi_wakeup_code)))
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/* early initialization routine */
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extern void acpi_reserve_wakeup_memory(void);
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@ -3,25 +3,36 @@
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_X86_TRAMPOLINE
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#include <linux/types.h>
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#include <asm/io.h>
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/*
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* Trampoline 80x86 program as an array.
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* Trampoline 80x86 program as an array. These are in the init rodata
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* segment, but that's okay, because we only care about the relative
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* addresses of the symbols.
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*/
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extern const unsigned char trampoline_data [];
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extern const unsigned char trampoline_end [];
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extern unsigned char *trampoline_base;
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extern const unsigned char x86_trampoline_start [];
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extern const unsigned char x86_trampoline_end [];
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extern unsigned char *x86_trampoline_base;
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extern unsigned long init_rsp;
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extern unsigned long initial_code;
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extern unsigned long initial_gs;
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#define TRAMPOLINE_SIZE roundup(trampoline_end - trampoline_data, PAGE_SIZE)
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extern void __init setup_trampolines(void);
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extern unsigned long setup_trampoline(void);
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extern void __init reserve_trampoline_memory(void);
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#else
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static inline void reserve_trampoline_memory(void) {}
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#endif /* CONFIG_X86_TRAMPOLINE */
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extern const unsigned char trampoline_data[];
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extern const unsigned char trampoline_status[];
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#define TRAMPOLINE_SYM(x) \
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((void *)(x86_trampoline_base + \
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((const unsigned char *)(x) - x86_trampoline_start)))
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/* Address of the SMP trampoline */
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static inline unsigned long trampoline_address(void)
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{
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return virt_to_phys(TRAMPOLINE_SYM(trampoline_data));
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}
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#endif /* __ASSEMBLY__ */
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@ -6,11 +6,17 @@
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#include <asm/page_types.h>
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#include <asm/pgtable_types.h>
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#include <asm/processor-flags.h>
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#include "wakeup.h"
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.code16
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.section ".header", "a"
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.section ".jump", "ax"
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.globl _start
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_start:
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cli
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jmp wakeup_code
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/* This should match the structure in wakeup.h */
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.section ".header", "a"
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.globl wakeup_header
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wakeup_header:
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video_mode: .short 0 /* Video mode number */
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@ -30,14 +36,11 @@ wakeup_jmp: .byte 0xea /* ljmpw */
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wakeup_jmp_off: .word 3f
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wakeup_jmp_seg: .word 0
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wakeup_gdt: .quad 0, 0, 0
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signature: .long 0x51ee1111
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signature: .long WAKEUP_HEADER_SIGNATURE
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.text
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.globl _start
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.code16
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wakeup_code:
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_start:
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cli
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cld
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/* Apparently some dimwit BIOS programmers don't know how to
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@ -77,12 +80,12 @@ _start:
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/* Check header signature... */
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movl signature, %eax
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cmpl $0x51ee1111, %eax
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cmpl $WAKEUP_HEADER_SIGNATURE, %eax
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jne bogus_real_magic
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/* Check we really have everything... */
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movl end_signature, %eax
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cmpl $0x65a22c82, %eax
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cmpl $WAKEUP_END_SIGNATURE, %eax
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jne bogus_real_magic
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/* Call the C code */
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@ -147,3 +150,7 @@ wakeup_heap:
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wakeup_stack:
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.space 2048
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wakeup_stack_end:
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.section ".signature","a"
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end_signature:
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.long WAKEUP_END_SIGNATURE
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@ -35,7 +35,8 @@ struct wakeup_header {
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extern struct wakeup_header wakeup_header;
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#endif
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#define HEADER_OFFSET 0x3f00
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#define WAKEUP_SIZE 0x4000
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#define WAKEUP_HEADER_OFFSET 8
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#define WAKEUP_HEADER_SIGNATURE 0x51ee1111
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#define WAKEUP_END_SIGNATURE 0x65a22c82
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#endif /* ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H */
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@ -13,9 +13,19 @@ ENTRY(_start)
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SECTIONS
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{
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. = 0;
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.jump : {
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*(.jump)
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} = 0x90909090
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. = WAKEUP_HEADER_OFFSET;
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.header : {
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*(.header)
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}
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. = ALIGN(16);
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.text : {
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*(.text*)
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}
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} = 0x90909090
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. = ALIGN(16);
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.rodata : {
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@ -33,11 +43,6 @@ SECTIONS
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*(.data*)
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}
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.signature : {
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end_signature = .;
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LONG(0x65a22c82)
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}
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. = ALIGN(16);
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.bss : {
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__bss_start = .;
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@ -45,20 +50,13 @@ SECTIONS
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__bss_end = .;
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}
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. = HEADER_OFFSET;
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.header : {
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*(.header)
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.signature : {
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*(.signature)
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}
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. = ALIGN(16);
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_end = .;
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/DISCARD/ : {
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*(.note*)
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}
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/*
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* The ASSERT() sink to . is intentional, for binutils 2.14 compatibility:
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*/
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. = ASSERT(_end <= WAKEUP_SIZE, "Wakeup too big!");
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}
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@ -18,12 +18,8 @@
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#include "realmode/wakeup.h"
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#include "sleep.h"
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unsigned long acpi_wakeup_address;
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unsigned long acpi_realmode_flags;
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/* address in low memory of the wakeup routine. */
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static unsigned long acpi_realmode;
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#if defined(CONFIG_SMP) && defined(CONFIG_64BIT)
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static char temp_stack[4096];
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#endif
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@ -33,22 +29,17 @@ static char temp_stack[4096];
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*
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* Create an identity mapped page table and copy the wakeup routine to
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* low memory.
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*
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* Note that this is too late to change acpi_wakeup_address.
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*/
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int acpi_save_state_mem(void)
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{
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struct wakeup_header *header;
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/* address in low memory of the wakeup routine. */
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char *acpi_realmode;
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if (!acpi_realmode) {
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printk(KERN_ERR "Could not allocate memory during boot, "
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"S3 disabled\n");
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return -ENOMEM;
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}
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memcpy((void *)acpi_realmode, &wakeup_code_start, WAKEUP_SIZE);
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acpi_realmode = TRAMPOLINE_SYM(acpi_wakeup_code);
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header = (struct wakeup_header *)(acpi_realmode + HEADER_OFFSET);
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if (header->signature != 0x51ee1111) {
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header = (struct wakeup_header *)(acpi_realmode + WAKEUP_HEADER_OFFSET);
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if (header->signature != WAKEUP_HEADER_SIGNATURE) {
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printk(KERN_ERR "wakeup header does not match\n");
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return -EINVAL;
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}
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@ -68,9 +59,7 @@ int acpi_save_state_mem(void)
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/* GDT[0]: GDT self-pointer */
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header->wakeup_gdt[0] =
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(u64)(sizeof(header->wakeup_gdt) - 1) +
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((u64)(acpi_wakeup_address +
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((char *)&header->wakeup_gdt - (char *)acpi_realmode))
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<< 16);
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((u64)__pa(&header->wakeup_gdt) << 16);
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/* GDT[1]: big real mode-like code segment */
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header->wakeup_gdt[1] =
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GDT_ENTRY(0x809b, acpi_wakeup_address, 0xfffff);
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@ -96,7 +85,7 @@ int acpi_save_state_mem(void)
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header->pmode_cr3 = (u32)__pa(&initial_page_table);
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saved_magic = 0x12345678;
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#else /* CONFIG_64BIT */
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header->trampoline_segment = setup_trampoline() >> 4;
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header->trampoline_segment = trampoline_address() >> 4;
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#ifdef CONFIG_SMP
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stack_start = (unsigned long)temp_stack + sizeof(temp_stack);
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early_gdt_descr.address =
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@ -117,46 +106,6 @@ void acpi_restore_state_mem(void)
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{
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}
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/**
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* acpi_reserve_wakeup_memory - do _very_ early ACPI initialisation
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*
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* We allocate a page from the first 1MB of memory for the wakeup
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* routine for when we come back from a sleep state. The
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* runtime allocator allows specification of <16MB pages, but not
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* <1MB pages.
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*/
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void __init acpi_reserve_wakeup_memory(void)
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{
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phys_addr_t mem;
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if ((&wakeup_code_end - &wakeup_code_start) > WAKEUP_SIZE) {
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printk(KERN_ERR
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"ACPI: Wakeup code way too big, S3 disabled.\n");
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return;
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}
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mem = memblock_find_in_range(0, 1<<20, WAKEUP_SIZE, PAGE_SIZE);
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if (mem == MEMBLOCK_ERROR) {
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printk(KERN_ERR "ACPI: Cannot allocate lowmem, S3 disabled.\n");
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return;
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}
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acpi_realmode = (unsigned long) phys_to_virt(mem);
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acpi_wakeup_address = mem;
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memblock_x86_reserve_range(mem, mem + WAKEUP_SIZE, "ACPI WAKEUP");
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}
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int __init acpi_configure_wakeup_memory(void)
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{
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if (acpi_realmode)
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set_memory_x(acpi_realmode, WAKEUP_SIZE >> PAGE_SHIFT);
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return 0;
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}
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arch_initcall(acpi_configure_wakeup_memory);
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static int __init acpi_sleep_setup(char *str)
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{
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while ((str != NULL) && (*str != '\0')) {
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@ -4,13 +4,10 @@
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#include <asm/trampoline.h>
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extern char wakeup_code_start, wakeup_code_end;
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extern unsigned long saved_video_mode;
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extern long saved_magic;
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extern int wakeup_pmode_return;
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extern char swsusp_pg_dir[PAGE_SIZE];
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extern unsigned long acpi_copy_wakeup_routine(unsigned long);
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extern void wakeup_long64(void);
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@ -2,9 +2,11 @@
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* Wrapper script for the realmode binary as a transport object
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* before copying to low memory.
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*/
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.section ".rodata","a"
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.globl wakeup_code_start, wakeup_code_end
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wakeup_code_start:
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#include <asm/page_types.h>
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.section ".x86_trampoline","a"
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.balign PAGE_SIZE
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.globl acpi_wakeup_code
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acpi_wakeup_code:
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.incbin "arch/x86/kernel/acpi/realmode/wakeup.bin"
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wakeup_code_end:
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.size wakeup_code_start, .-wakeup_code_start
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@ -937,13 +937,6 @@ void __init setup_arch(char **cmdline_p)
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setup_trampolines();
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#ifdef CONFIG_ACPI_SLEEP
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/*
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* Reserve low memory region for sleep support.
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* even before init_memory_mapping
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*/
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acpi_reserve_wakeup_memory();
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#endif
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init_gbpages();
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/* max_pfn_mapped is updated here */
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@ -16,6 +16,7 @@
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#include <linux/device.h>
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#include <linux/suspend.h>
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#include <linux/reboot.h>
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#include <linux/acpi.h>
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#include <asm/io.h>
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