/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* Copyright (c) 2014 The FreeBSD Foundation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#define __ELF_WORD_SIZE 64
#include <sys/param.h>
#include <sys/exec.h>
#include <sys/linker.h>
#include <string.h>
#include <machine/elf.h>
#include <stand.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <efi.h>
#include <efilib.h>
#include "bootstrap.h"
#include "platform/acfreebsd.h"
#include "acconfig.h"
#define ACPI_SYSTEM_XFACE
#include "actypes.h"
#include "actbl.h"
#include "loader_efi.h"
static EFI_GUID acpi_guid = ACPI_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);
static int elf64_exec(struct preloaded_file *amp);
static int elf64_obj_exec(struct preloaded_file *amp);
static struct file_format amd64_elf = {
.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[] = {
&amd64_elf,
&amd64_elf_obj,
NULL
};
static pml4_entry_t *PT4;
static pdp_entry_t *PT3;
static pd_entry_t *PT2;
static void (*trampoline)(uint64_t stack, void *copy_finish, uint64_t kernend,
uint64_t modulep, pml4_entry_t *pagetable, uint64_t entry);
extern uintptr_t amd64_tramp;
extern uint32_t amd64_tramp_size;
/*
* There is an ELF kernel and one or more ELF modules loaded.
* We wish to start executing the kernel image, so make such
* preparations as are required, and do so.
*/
static int
elf64_exec(struct preloaded_file *fp)
{
struct file_metadata *md;
Elf_Ehdr *ehdr;
vm_offset_t modulep, kernend, trampcode, trampstack;
int err, i;
ACPI_TABLE_RSDP *rsdp;
char buf[24];
int revision;
/*
* Report the RSDP to the kernel. While this can be found with
* a BIOS boot, the RSDP may be elsewhere when booted from UEFI.
* The old code used the 'hints' method to communite this to
* the kernel. However, while convenient, the 'hints' method
* is fragile and does not work when static hints are compiled
* into the kernel. Instead, move to setting different tunables
* that start with acpi. The old 'hints' can be removed before
* we branch for FreeBSD 12.
*/
rsdp = efi_get_table(&acpi20_guid);
if (rsdp == NULL) {
rsdp = efi_get_table(&acpi_guid);
}
if (rsdp != NULL) {
sprintf(buf, "0x%016llx", (unsigned long long)rsdp);
setenv("hint.acpi.0.rsdp", buf, 1);
setenv("acpi.rsdp", buf, 1);
revision = rsdp->Revision;
if (revision == 0)
revision = 1;
sprintf(buf, "%d", revision);
setenv("hint.acpi.0.revision", buf, 1);
setenv("acpi.revision", buf, 1);
strncpy(buf, rsdp->OemId, sizeof(rsdp->OemId));
buf[sizeof(rsdp->OemId)] = '\0';
setenv("hint.acpi.0.oem", buf, 1);
setenv("acpi.oem", buf, 1);
sprintf(buf, "0x%016x", rsdp->RsdtPhysicalAddress);
setenv("hint.acpi.0.rsdt", buf, 1);
setenv("acpi.rsdt", buf, 1);
if (revision >= 2) {
/* XXX extended checksum? */
sprintf(buf, "0x%016llx",
(unsigned long long)rsdp->XsdtPhysicalAddress);
setenv("hint.acpi.0.xsdt", buf, 1);
setenv("acpi.xsdt", buf, 1);
sprintf(buf, "%d", rsdp->Length);
setenv("hint.acpi.0.xsdt_length", buf, 1);
setenv("acpi.xsdt_length", buf, 1);
}
}
if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
return(EFTYPE);
ehdr = (Elf_Ehdr *)&(md->md_data);
trampcode = (vm_offset_t)0x0000000040000000;
err = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 1,
(EFI_PHYSICAL_ADDRESS *)&trampcode);
bzero((void *)trampcode, EFI_PAGE_SIZE);
trampstack = trampcode + EFI_PAGE_SIZE - 8;
bcopy((void *)&amd64_tramp, (void *)trampcode, amd64_tramp_size);
trampoline = (void *)trampcode;
PT4 = (pml4_entry_t *)0x0000000040000000;
err = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 3,
(EFI_PHYSICAL_ADDRESS *)&PT4);
bzero(PT4, 3 * EFI_PAGE_SIZE);
PT3 = &PT4[512];
PT2 = &PT3[512];
/*
* 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
* adequate.
*/
for (i = 0; i < 512; i++) {
/* Each slot of the L4 pages points to the same L3 page. */
PT4[i] = (pml4_entry_t)PT3;
PT4[i] |= PG_V | PG_RW;
/* Each slot of the L3 pages points to the same L2 page. */
PT3[i] = (pdp_entry_t)PT2;
PT3[i] |= PG_V | PG_RW;
/* The L2 page slots are mapped with 2MB pages for 1GB. */
PT2[i] = i * (2 * 1024 * 1024);
PT2[i] |= PG_V | PG_RW | PG_PS;
}
printf("Start @ 0x%lx ...\n", ehdr->e_entry);
efi_time_fini();
err = bi_load(fp->f_args, &modulep, &kernend);
if (err != 0) {
efi_time_init();
return(err);
}
dev_cleanup();
trampoline(trampstack, efi_copy_finish, kernend, modulep, PT4,
ehdr->e_entry);
panic("exec returned");
}
static int
elf64_obj_exec(struct preloaded_file *fp)
{
return (EFTYPE);
}