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#include <stdint.h>
#include <purgatory.h>
#include "purgatory-x86.h"
/*
* CPU
* =============================================================================
*/
void x86_setup_cpu(void)
{
#if 0
/* This code is only needed for old versions of the kexec kernel patch.
* While it is still a good idea doing this unconditionally breaks
* on older cpus that did not implemented cr4.
* So this code is disabled for now. If this is revisited
* I first need to detect cpuid support and then use cpuid
* to conditionally change newer cpu registers.
*/
/* clear special bits in %cr4 */
asm volatile(
"movl %0, %%eax\n\t"
"movl %%eax, %%cr4\n\t"
: /* outputs */
: "r" (0)
);
#endif
}
uint8_t reset_vga = 0;
uint8_t legacy_timer = 0;
uint8_t legacy_pic = 0;
uint8_t panic_kernel = 0;
unsigned long jump_back_entry = 0;
char *cmdline_end = 0;
void setup_arch(void)
{
x86_setup_cpu();
if (reset_vga) x86_reset_vga();
if (legacy_pic) x86_setup_legacy_pic();
/* if (legacy_timer) x86_setup_legacy_timer(); */
}
static void x86_setup_jump_back_entry(void)
{
if (cmdline_end)
sprintf(cmdline_end, " kexec_jump_back_entry=0x%x",
jump_back_entry);
}
/* This function can be used to execute after the SHA256 verification. */
void post_verification_setup_arch(void)
{
if (panic_kernel) crashdump_backup_memory();
if (jump_back_entry) x86_setup_jump_back_entry();
}
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