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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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10f2a2b0f6
* 'x86-trampoline-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86-32, mm: Add an initial page table for core bootstrapping
41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
#include <linux/io.h>
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#include <linux/memblock.h>
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#include <asm/trampoline.h>
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#include <asm/pgtable.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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phys_addr_t 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 = memblock_find_in_range(0, 1<<20, TRAMPOLINE_SIZE, PAGE_SIZE);
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if (mem == MEMBLOCK_ERROR)
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panic("Cannot allocate trampoline\n");
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trampoline_base = __va(mem);
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memblock_x86_reserve_range(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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