| #include <console/console.h> |
| #include <arch/stages.h> |
| #include <ip_checksum.h> |
| #include <string.h> |
| #include <cpu/x86/multiboot.h> |
| |
| #if CONFIG_RELOCATABLE_RAMSTAGE |
| /* When the ramstage is relocatable the elf loading ensures an elf image cannot |
| * be loaded over the ramstage code. */ |
| void jmp_to_elf_entry(void *entry, unsigned long unused1, unsigned long unused2) |
| { |
| /* Jump to kernel */ |
| __asm__ __volatile__( |
| " cld \n\t" |
| /* Now jump to the loaded image */ |
| " call *%0\n\t" |
| |
| /* The loaded image returned? */ |
| " cli \n\t" |
| " cld \n\t" |
| |
| :: |
| "r" (entry) |
| #if CONFIG_MULTIBOOT |
| , "b"(mbi), "a" (MB_MAGIC2) |
| #endif |
| ); |
| } |
| #else |
| void jmp_to_elf_entry(void *entry, unsigned long buffer, unsigned long size) |
| { |
| extern unsigned char _ram_seg, _eram_seg; |
| unsigned long lb_start, lb_size; |
| |
| lb_start = (unsigned long)&_ram_seg; |
| lb_size = (unsigned long)(&_eram_seg - &_ram_seg); |
| |
| printk(BIOS_SPEW, "entry = 0x%08lx\n", (unsigned long)entry); |
| printk(BIOS_SPEW, "lb_start = 0x%08lx\n", lb_start); |
| printk(BIOS_SPEW, "lb_size = 0x%08lx\n", lb_size); |
| printk(BIOS_SPEW, "buffer = 0x%08lx\n", buffer); |
| |
| /* Jump to kernel */ |
| __asm__ __volatile__( |
| " cld \n\t" |
| /* Save the callee save registers... */ |
| " pushl %%esi\n\t" |
| " pushl %%edi\n\t" |
| " pushl %%ebx\n\t" |
| /* Save the parameters I was passed */ |
| " pushl $0\n\t" /* 20 adjust */ |
| " pushl %0\n\t" /* 16 lb_start */ |
| " pushl %1\n\t" /* 12 buffer */ |
| " pushl %2\n\t" /* 8 lb_size */ |
| " pushl %3\n\t" /* 4 entry */ |
| " pushl %4\n\t" /* 0 elf_boot_notes */ |
| /* Compute the adjustment */ |
| " xorl %%eax, %%eax\n\t" |
| " subl 16(%%esp), %%eax\n\t" |
| " addl 12(%%esp), %%eax\n\t" |
| " addl 8(%%esp), %%eax\n\t" |
| " movl %%eax, 20(%%esp)\n\t" |
| /* Place a copy of coreboot in its new location */ |
| /* Move ``longs'' the coreboot size is 4 byte aligned */ |
| " movl 12(%%esp), %%edi\n\t" |
| " addl 8(%%esp), %%edi\n\t" |
| " movl 16(%%esp), %%esi\n\t" |
| " movl 8(%%esp), %%ecx\n\n" |
| " shrl $2, %%ecx\n\t" |
| " rep movsl\n\t" |
| |
| /* Adjust the stack pointer to point into the new coreboot image */ |
| " addl 20(%%esp), %%esp\n\t" |
| /* Adjust the instruction pointer to point into the new coreboot image */ |
| " movl $1f, %%eax\n\t" |
| " addl 20(%%esp), %%eax\n\t" |
| " jmp *%%eax\n\t" |
| "1: \n\t" |
| |
| /* Copy the coreboot bounce buffer over coreboot */ |
| /* Move ``longs'' the coreboot size is 4 byte aligned */ |
| " movl 16(%%esp), %%edi\n\t" |
| " movl 12(%%esp), %%esi\n\t" |
| " movl 8(%%esp), %%ecx\n\t" |
| " shrl $2, %%ecx\n\t" |
| " rep movsl\n\t" |
| |
| /* Now jump to the loaded image */ |
| " movl %5, %%eax\n\t" |
| " movl 0(%%esp), %%ebx\n\t" |
| " call *4(%%esp)\n\t" |
| |
| /* The loaded image returned? */ |
| " cli \n\t" |
| " cld \n\t" |
| |
| /* Copy the saved copy of coreboot where coreboot runs */ |
| /* Move ``longs'' the coreboot size is 4 byte aligned */ |
| " movl 16(%%esp), %%edi\n\t" |
| " movl 12(%%esp), %%esi\n\t" |
| " addl 8(%%esp), %%esi\n\t" |
| " movl 8(%%esp), %%ecx\n\t" |
| " shrl $2, %%ecx\n\t" |
| " rep movsl\n\t" |
| |
| /* Adjust the stack pointer to point into the old coreboot image */ |
| " subl 20(%%esp), %%esp\n\t" |
| |
| /* Adjust the instruction pointer to point into the old coreboot image */ |
| " movl $1f, %%eax\n\t" |
| " subl 20(%%esp), %%eax\n\t" |
| " jmp *%%eax\n\t" |
| "1: \n\t" |
| |
| /* Drop the parameters I was passed */ |
| " addl $24, %%esp\n\t" |
| |
| /* Restore the callee save registers */ |
| " popl %%ebx\n\t" |
| " popl %%edi\n\t" |
| " popl %%esi\n\t" |
| |
| :: |
| "ri" (lb_start), "ri" (buffer), "ri" (lb_size), |
| "ri" (entry), |
| #if CONFIG_MULTIBOOT |
| "ri"(mbi), "ri" (MB_MAGIC2) |
| #else |
| "ri"(0), "ri" (0) |
| #endif |
| ); |
| } |
| #endif /* CONFIG_RELOCATABLE_RAMSTAGE */ |
| |
| |