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Differential D7934 Diff 20462 head/sys/boot/efi/loader/arch/amd64/elf64_freebsd.c

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head/sys/boot/efi/loader/arch/amd64/elf64_freebsd.c

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#define __ELF_WORD_SIZE 64 #define __ELF_WORD_SIZE 64
#include <sys/param.h> #include <sys/param.h>
#include <sys/exec.h> #include <sys/exec.h>
#include <sys/linker.h> #include <sys/linker.h>
#include <string.h> #include <string.h>
#include <machine/elf.h> #include <machine/elf.h>
#include <stand.h> #include <stand.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <efi.h> #include <efi.h>
#include <efilib.h> #include <efilib.h>
#include "bootstrap.h" #include "bootstrap.h"
#include "platform/acfreebsd.h" #include "platform/acfreebsd.h"
#include "acconfig.h" #include "acconfig.h"
#define ACPI_SYSTEM_XFACE #define ACPI_SYSTEM_XFACE
#include "actypes.h" #include "actypes.h"
#include "actbl.h" #include "actbl.h"
#include "loader_efi.h" #include "loader_efi.h"
static EFI_GUID acpi_guid = ACPI_TABLE_GUID; static EFI_GUID acpi_guid = ACPI_TABLE_GUID;
static EFI_GUID acpi20_guid = ACPI_20_TABLE_GUID; static EFI_GUID acpi20_guid = ACPI_20_TABLE_GUID;
extern int bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp); extern int bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp);
static int elf64_exec(struct preloaded_file *amp); static int elf64_exec(struct preloaded_file *amp);
static int elf64_obj_exec(struct preloaded_file *amp); static int elf64_obj_exec(struct preloaded_file *amp);
static struct file_format amd64_elf = { elf64_loadfile, elf64_exec }; static struct file_format amd64_elf = {
static struct file_format amd64_elf_obj = { elf64_obj_loadfile, elf64_obj_exec }; .l_load = elf64_loadfile,
.l_exec = elf64_exec,
};
static struct file_format amd64_elf_obj = {
.l_load = elf64_obj_loadfile,
.l_exec = elf64_obj_exec,
};
struct file_format *file_formats[] = { struct file_format *file_formats[] = {
&amd64_elf, &amd64_elf,
&amd64_elf_obj, &amd64_elf_obj,
NULL NULL
}; };
#define PG_V 0x001 static pml4_entry_t *PT4;
#define PG_RW 0x002 static pdp_entry_t *PT3;
#define PG_U 0x004 static pd_entry_t *PT2;
#define PG_PS 0x080
typedef u_int64_t p4_entry_t;
typedef u_int64_t p3_entry_t;
typedef u_int64_t p2_entry_t;
static p4_entry_t *PT4;
static p3_entry_t *PT3;
static p2_entry_t *PT2;
static void (*trampoline)(uint64_t stack, void *copy_finish, uint64_t kernend, static void (*trampoline)(uint64_t stack, void *copy_finish, uint64_t kernend,
uint64_t modulep, p4_entry_t *pagetable, uint64_t modulep, pml4_entry_t *pagetable, uint64_t entry);
uint64_t entry);
extern uintptr_t amd64_tramp; extern uintptr_t amd64_tramp;
extern uint32_t amd64_tramp_size; extern uint32_t amd64_tramp_size;
/* /*
* There is an ELF kernel and one or more ELF modules loaded. * There is an ELF kernel and one or more ELF modules loaded.
* We wish to start executing the kernel image, so make such * We wish to start executing the kernel image, so make such
* preparations as are required, and do so. * preparations as are required, and do so.
▲ Show 20 Lines • Show All 60 Lines • ▼ Show 20 Lineself64_exec(struct preloaded_file *fp)
trampcode = (vm_offset_t)0x0000000040000000; trampcode = (vm_offset_t)0x0000000040000000;
err = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 1, err = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 1,
(EFI_PHYSICAL_ADDRESS *)&trampcode); (EFI_PHYSICAL_ADDRESS *)&trampcode);
bzero((void *)trampcode, EFI_PAGE_SIZE); bzero((void *)trampcode, EFI_PAGE_SIZE);
trampstack = trampcode + EFI_PAGE_SIZE - 8; trampstack = trampcode + EFI_PAGE_SIZE - 8;
bcopy((void *)&amd64_tramp, (void *)trampcode, amd64_tramp_size); bcopy((void *)&amd64_tramp, (void *)trampcode, amd64_tramp_size);
trampoline = (void *)trampcode; trampoline = (void *)trampcode;
PT4 = (p4_entry_t *)0x0000000040000000; PT4 = (pml4_entry_t *)0x0000000040000000;
err = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 3, err = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 3,
(EFI_PHYSICAL_ADDRESS *)&PT4); (EFI_PHYSICAL_ADDRESS *)&PT4);
bzero(PT4, 3 * EFI_PAGE_SIZE); bzero(PT4, 3 * EFI_PAGE_SIZE);
PT3 = &PT4[512]; PT3 = &PT4[512];
PT2 = &PT3[512]; PT2 = &PT3[512];
/* /*
* This is kinda brutal, but every single 1GB VM memory segment points * This is kinda brutal, but every single 1GB VM memory segment points
* to the same first 1GB of physical memory. But it is more than * to the same first 1GB of physical memory. But it is more than
* adequate. * adequate.
*/ */
for (i = 0; i < 512; i++) { for (i = 0; i < 512; i++) {
/* Each slot of the L4 pages points to the same L3 page. */ /* Each slot of the L4 pages points to the same L3 page. */
PT4[i] = (p4_entry_t)PT3; PT4[i] = (pml4_entry_t)PT3;
PT4[i] |= PG_V | PG_RW | PG_U; PT4[i] |= PG_V | PG_RW | PG_U;
/* Each slot of the L3 pages points to the same L2 page. */ /* Each slot of the L3 pages points to the same L2 page. */
PT3[i] = (p3_entry_t)PT2; PT3[i] = (pdp_entry_t)PT2;
PT3[i] |= PG_V | PG_RW | PG_U; PT3[i] |= PG_V | PG_RW | PG_U;
/* The L2 page slots are mapped with 2MB pages for 1GB. */ /* The L2 page slots are mapped with 2MB pages for 1GB. */
PT2[i] = i * (2 * 1024 * 1024); PT2[i] = i * (2 * 1024 * 1024);
PT2[i] |= PG_V | PG_RW | PG_PS | PG_U; PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
} }
printf("Start @ 0x%lx ...\n", ehdr->e_entry); printf("Start @ 0x%lx ...\n", ehdr->e_entry);
Show All 11 Lines trampoline(trampstack, efi_copy_finish, kernend, modulep, PT4,
ehdr->e_entry); ehdr->e_entry);
panic("exec returned"); panic("exec returned");
} }
static int static int
elf64_obj_exec(struct preloaded_file *fp) elf64_obj_exec(struct preloaded_file *fp)
{ {
return (EFTYPE); return (EFTYPE);
} }