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Borislav Petkov
b40827fa72
This patch adds an initial page table with low mappings used exclusively for booting APs/resuming after ACPI suspend/machine restart. After this, there's no need to add low mappings to swapper_pg_dir and zap them later or create own swsusp PGD page solely for ACPI sleep needs - we have initial_page_table for that. Signed-off-by: Borislav Petkov <bp@alien8.de> LKML-Reference: <20101020070526.GA9588@liondog.tnic> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
41 lines
1014 B
C
41 lines
1014 B
C
#include <linux/io.h>
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#include <asm/trampoline.h>
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#include <asm/pgtable.h>
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#include <asm/e820.h>
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#if defined(CONFIG_X86_64) && defined(CONFIG_ACPI_SLEEP)
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#define __trampinit
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#define __trampinitdata
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#else
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#define __trampinit __cpuinit
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#define __trampinitdata __cpuinitdata
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#endif
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/* ready for x86_64 and x86 */
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unsigned char *__trampinitdata trampoline_base;
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void __init reserve_trampoline_memory(void)
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{
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unsigned long mem;
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/* Has to be in very low memory so we can execute real-mode AP code. */
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mem = find_e820_area(0, 1<<20, TRAMPOLINE_SIZE, PAGE_SIZE);
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if (mem == -1L)
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panic("Cannot allocate trampoline\n");
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trampoline_base = __va(mem);
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reserve_early(mem, mem + TRAMPOLINE_SIZE, "TRAMPOLINE");
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}
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/*
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* Currently trivial. Write the real->protected mode
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* bootstrap into the page concerned. The caller
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* has made sure it's suitably aligned.
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*/
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unsigned long __trampinit setup_trampoline(void)
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{
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memcpy(trampoline_base, trampoline_data, TRAMPOLINE_SIZE);
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return virt_to_phys(trampoline_base);
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}
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