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Relocate kernel to high address space (a static + 64 MB for now) to avoid

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conflicts with the Linux host kernel. This lets you kexec an unmodified
GENERIC64.
This commit is contained in:
nwhitehorn 2015-01-31 19:42:08 +00:00
parent 5e1a593992
commit 5dd7abbde7
4 changed files with 29 additions and 10 deletions
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4
sys/boot/powerpc/kboot/conf.c
View File

@ -115,7 +115,3 @@ struct console *consoles[] = {
NULL
};
/*
* reloc - our load address
*/
vm_offset_t reloc = RELOC;

2
sys/boot/powerpc/kboot/kerneltramp.S
View File

@ -9,6 +9,7 @@
* to the absolute address 0x60. Here we implement a loop waiting on the release
* of a lock by the kernel at 0x40.
*
* $FreeBSD$
*/
#include <machine/asm.h>
@ -39,7 +40,6 @@ CNAME(kerneltramp):
mflr %r8
mtlr %r9
lwz %r3,0(%r8)
ld %r3,0(%r3) /* Resolve function descriptor */
mtctr %r3
lwz %r3,4(%r8)
lwz %r4,8(%r8)

18
sys/boot/powerpc/kboot/main.c
View File

@ -48,6 +48,7 @@ ssize_t kboot_copyin(const void *src, vm_offset_t dest, const size_t len);
ssize_t kboot_copyout(vm_offset_t src, void *dest, const size_t len);
ssize_t kboot_readin(const int fd, vm_offset_t dest, const size_t len);
int kboot_autoload(void);
uint64_t kboot_loadaddr(u_int type, void *data, uint64_t addr);
int kboot_setcurrdev(struct env_var *ev, int flags, const void *value);
extern int command_fdt_internal(int argc, char *argv[]);
@ -116,6 +117,7 @@ main(int argc, const char **argv)
archsw.arch_copyout = kboot_copyout;
archsw.arch_readin = kboot_readin;
archsw.arch_autoload = kboot_autoload;
archsw.arch_loadaddr = kboot_loadaddr;
printf("\n");
printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
@ -282,6 +284,22 @@ kboot_autoload(void)
return (0);
}
uint64_t
kboot_loadaddr(u_int type, void *data, uint64_t addr)
{
/*
* Need to stay out of the way of Linux. /chosen/linux,kernel-end does
* a better job here, but use a fixed offset for now.
*/
if (type == LOAD_ELF)
addr = roundup(addr, PAGE_SIZE);
else
addr += 64*1024*1024; /* Stay out of the way of Linux */
return (addr);
}
void
_start(int argc, const char **argv, char **env)
{

15
sys/boot/powerpc/kboot/ppc64_elf_freebsd.c
View File

@ -41,7 +41,6 @@ __FBSDID("$FreeBSD$");
#include "host_syscall.h"
extern char end[];
extern vm_offset_t reloc; /* From <arch>/conf.c */
extern void *kerneltramp;
extern size_t szkerneltramp;
extern int nkexec_segments;
@ -68,17 +67,22 @@ ppc64_elf_exec(struct preloaded_file *fp)
Elf_Ehdr *e;
int error;
uint32_t *trampoline;
vm_offset_t trampolinebase = 96*1024*1024; /* XXX */
uint64_t entry;
vm_offset_t trampolinebase;
if ((fmp = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL) {
return(EFTYPE);
}
e = (Elf_Ehdr *)&fmp->md_data;
/* Handle function descriptor */
/* Figure out where to put it */
trampolinebase = archsw.arch_loadaddr(LOAD_RAW, NULL, 0);
/* Set up interesting values in function descriptor */
trampoline = malloc(szkerneltramp);
memcpy(trampoline, &kerneltramp, szkerneltramp);
trampoline[2] = e->e_entry;
archsw.arch_copyout(e->e_entry + elf64_relocation_offset, &entry, 8);
trampoline[2] = entry + elf64_relocation_offset;
trampoline[4] = 0; /* Phys. mem offset */
trampoline[5] = 0; /* OF entry point */
@ -88,7 +92,8 @@ ppc64_elf_exec(struct preloaded_file *fp)
trampoline[3] = dtb;
trampoline[6] = mdp;
trampoline[7] = sizeof(mdp);
printf("Kernel entry at %#jx ...\n", e->e_entry);
printf("Kernel entry at %#jx (%#x) ...\n", e->e_entry, trampoline[2]);
printf("DTB at %#x, mdp at %#x\n", dtb, mdp);
dev_cleanup();