/*- * Copyright (c) 1998 Michael Smith * 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. */ #define __ELF_WORD_SIZE 64 #include #include #include #include #include #include #include #include #include #include #include "bootstrap.h" #include "loader_efi.h" extern int bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp, bool exit_bs); 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, }; extern struct file_format multiboot2; extern struct file_format multiboot2_obj; struct file_format *file_formats[] = { &multiboot2, &multiboot2_obj, &amd64_elf, &amd64_elf_obj, NULL }; static pml4_entry_t *PT4; static pdp_entry_t *PT3; static pdp_entry_t *PT3_l, *PT3_u; static pd_entry_t *PT2; static pd_entry_t *PT2_l0, *PT2_l1, *PT2_l2, *PT2_l3, *PT2_u0, *PT2_u1; extern EFI_PHYSICAL_ADDRESS staging; 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; bool copy_auto; copy_auto = copy_staging == COPY_STAGING_AUTO; if (copy_auto) copy_staging = fp->f_kernphys_relocatable ? COPY_STAGING_DISABLE : COPY_STAGING_ENABLE; if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL) return (EFTYPE); ehdr = (Elf_Ehdr *)&(md->md_data); trampcode = copy_staging == COPY_STAGING_ENABLE ? (vm_offset_t)0x0000000040000000 /* 1G */ : (vm_offset_t)0x0000000100000000; /* 4G */; err = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 1, (EFI_PHYSICAL_ADDRESS *)&trampcode); if (EFI_ERROR(err)) { printf("Unable to allocate trampoline\n"); if (copy_auto) copy_staging = COPY_STAGING_AUTO; return (ENOMEM); } bzero((void *)trampcode, EFI_PAGE_SIZE); trampstack = trampcode + EFI_PAGE_SIZE - 8; bcopy((void *)&amd64_tramp, (void *)trampcode, amd64_tramp_size); trampoline = (void *)trampcode; if (copy_staging == COPY_STAGING_ENABLE) { PT4 = (pml4_entry_t *)0x0000000040000000; /* 1G */ err = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 3, (EFI_PHYSICAL_ADDRESS *)&PT4); if (EFI_ERROR(err)) { printf("Unable to allocate trampoline page table\n"); BS->FreePages(trampcode, 1); if (copy_auto) copy_staging = COPY_STAGING_AUTO; return (ENOMEM); } 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 < NPTEPG; 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] = (pd_entry_t)i * (2 * 1024 * 1024); PT2[i] |= PG_V | PG_RW | PG_PS; } } else { PT4 = (pml4_entry_t *)0x0000000100000000; /* 4G */ err = BS->AllocatePages(AllocateMaxAddress, EfiLoaderData, 9, (EFI_PHYSICAL_ADDRESS *)&PT4); if (EFI_ERROR(err)) { printf("Unable to allocate trampoline page table\n"); BS->FreePages(trampcode, 9); if (copy_auto) copy_staging = COPY_STAGING_AUTO; return (ENOMEM); } bzero(PT4, 9 * EFI_PAGE_SIZE); PT3_l = &PT4[NPML4EPG * 1]; PT3_u = &PT4[NPML4EPG * 2]; PT2_l0 = &PT4[NPML4EPG * 3]; PT2_l1 = &PT4[NPML4EPG * 4]; PT2_l2 = &PT4[NPML4EPG * 5]; PT2_l3 = &PT4[NPML4EPG * 6]; PT2_u0 = &PT4[NPML4EPG * 7]; PT2_u1 = &PT4[NPML4EPG * 8]; /* 1:1 mapping of lower 4G */ PT4[0] = (pml4_entry_t)PT3_l | PG_V | PG_RW; PT3_l[0] = (pdp_entry_t)PT2_l0 | PG_V | PG_RW; PT3_l[1] = (pdp_entry_t)PT2_l1 | PG_V | PG_RW; PT3_l[2] = (pdp_entry_t)PT2_l2 | PG_V | PG_RW; PT3_l[3] = (pdp_entry_t)PT2_l3 | PG_V | PG_RW; for (i = 0; i < 4 * NPDEPG; i++) { PT2_l0[i] = ((pd_entry_t)i << PDRSHIFT) | PG_V | PG_RW | PG_PS; } /* mapping of kernel 2G below top */ PT4[NPML4EPG - 1] = (pml4_entry_t)PT3_u | PG_V | PG_RW; PT3_u[NPDPEPG - 2] = (pdp_entry_t)PT2_u0 | PG_V | PG_RW; PT3_u[NPDPEPG - 1] = (pdp_entry_t)PT2_u1 | PG_V | PG_RW; /* compat mapping of phys @0 */ PT2_u0[0] = PG_PS | PG_V | PG_RW; /* this maps past staging area */ for (i = 1; i < 2 * NPDEPG; i++) { PT2_u0[i] = ((pd_entry_t)staging + ((pd_entry_t)i - 1) * NBPDR) | PG_V | PG_RW | PG_PS; } } printf("staging %#lx (%scopying) tramp %p PT4 %p\n", staging, copy_staging == COPY_STAGING_ENABLE ? "" : "not ", trampoline, PT4); printf("Start @ 0x%lx ...\n", ehdr->e_entry); efi_time_fini(); err = bi_load(fp->f_args, &modulep, &kernend, true); if (err != 0) { efi_time_init(); if (copy_auto) copy_staging = COPY_STAGING_AUTO; return (err); } dev_cleanup(); trampoline(trampstack, copy_staging == COPY_STAGING_ENABLE ? efi_copy_finish : efi_copy_finish_nop, kernend, modulep, PT4, ehdr->e_entry); panic("exec returned"); } static int elf64_obj_exec(struct preloaded_file *fp) { return (EFTYPE); }