forked from Minki/linux
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>
|
|
#include <linux/memblock.h>
|
|
|
|
#include <asm/trampoline.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
#if defined(CONFIG_X86_64) && defined(CONFIG_ACPI_SLEEP)
|
|
#define __trampinit
|
|
#define __trampinitdata
|
|
#else
|
|
#define __trampinit __cpuinit
|
|
#define __trampinitdata __cpuinitdata
|
|
#endif
|
|
|
|
/* ready for x86_64 and x86 */
|
|
unsigned char *__trampinitdata trampoline_base;
|
|
|
|
void __init reserve_trampoline_memory(void)
|
|
{
|
|
phys_addr_t mem;
|
|
|
|
/* Has to be in very low memory so we can execute real-mode AP code. */
|
|
mem = memblock_find_in_range(0, 1<<20, TRAMPOLINE_SIZE, PAGE_SIZE);
|
|
if (mem == MEMBLOCK_ERROR)
|
|
panic("Cannot allocate trampoline\n");
|
|
|
|
trampoline_base = __va(mem);
|
|
memblock_x86_reserve_range(mem, mem + TRAMPOLINE_SIZE, "TRAMPOLINE");
|
|
}
|
|
|
|
/*
|
|
* Currently trivial. Write the real->protected mode
|
|
* bootstrap into the page concerned. The caller
|
|
* has made sure it's suitably aligned.
|
|
*/
|
|
unsigned long __trampinit setup_trampoline(void)
|
|
{
|
|
memcpy(trampoline_base, trampoline_data, TRAMPOLINE_SIZE);
|
|
return virt_to_phys(trampoline_base);
|
|
}
|