diff options
Diffstat (limited to 'grub-core/kern/arm/uboot')
-rw-r--r-- | grub-core/kern/arm/uboot/init.c | 70 | ||||
-rw-r--r-- | grub-core/kern/arm/uboot/uboot.S | 73 |
2 files changed, 143 insertions, 0 deletions
diff --git a/grub-core/kern/arm/uboot/init.c b/grub-core/kern/arm/uboot/init.c new file mode 100644 index 0000000..2a6aa3f --- /dev/null +++ b/grub-core/kern/arm/uboot/init.c @@ -0,0 +1,70 @@ +/* init.c - generic U-Boot initialization and finalization */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2016 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <grub/uboot/uboot.h> +#include <grub/arm/startup.h> +#include <grub/uboot/api_public.h> + +extern int (*grub_uboot_syscall_ptr) (int, int *, ...); + +grub_uint32_t +grub_uboot_get_machine_type (void) +{ + return grub_arm_saved_registers.r[1]; +} + +grub_addr_t +grub_uboot_get_boot_data (void) +{ + return grub_arm_saved_registers.r[2]; +} + +int +grub_uboot_api_init (void) +{ + struct api_signature *start, *end; + struct api_signature *p; + grub_addr_t grub_uboot_search_hint = grub_arm_saved_registers.sp; + if (grub_uboot_search_hint) + { + /* Extended search range to work around Trim Slice U-Boot issue */ + start = (struct api_signature *) ((grub_uboot_search_hint & ~0x000fffff) + - 0x00500000); + end = + (struct api_signature *) ((grub_addr_t) start + UBOOT_API_SEARCH_LEN - + API_SIG_MAGLEN + 0x00500000); + } + else + { + start = 0; + end = (struct api_signature *) (256 * 1024 * 1024); + } + + /* Structure alignment is (at least) 8 bytes */ + for (p = start; p < end; p = (void *) ((grub_addr_t) p + 8)) + { + if (grub_memcmp (&(p->magic), API_SIG_MAGIC, API_SIG_MAGLEN) == 0) + { + grub_uboot_syscall_ptr = p->syscall; + return p->version; + } + } + + return 0; +} diff --git a/grub-core/kern/arm/uboot/uboot.S b/grub-core/kern/arm/uboot/uboot.S new file mode 100644 index 0000000..d128775 --- /dev/null +++ b/grub-core/kern/arm/uboot/uboot.S @@ -0,0 +1,73 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2013 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <grub/offsets.h> +#include <grub/symbol.h> +#include <grub/machine/kernel.h> + + /* + * uboot_syscall(): + * This function is effectively a veneer, so it cannot + * modify the stack or corrupt any registers other than + * r12 (ip). Furthermore it needs to restore r8 for + * U-Boot (Global Data Pointer) and preserve it for Grub. + */ +FUNCTION(grub_uboot_syscall) + str r8, transition_space + str lr, transition_space + 4 + str r9, transition_space + 8 + + ldr ip, saved_registers_ptr + ldr r8, [ip, #4 * 8] + ldr r9, [ip, #4 * 9] + + bl do_syscall + + ldr r8, transition_space + ldr lr, transition_space + 4 + ldr r9, transition_space + 8 + + bx lr +do_syscall: + + ldr ip, grub_uboot_syscall_ptr + bx ip + +FUNCTION(grub_uboot_return) + ldr ip, saved_registers_ptr + ldr sp, [ip, #4 * 4] + pop {r4-r12, lr} + mov sp, r12 + bx lr + + + .align 3 + +@ GRUB context stack space +transition_space: + .long 0 @ r8 + .long 0 @ lr + .long 0 @ r9 + +saved_registers_ptr: + .long EXT_C(grub_arm_saved_registers) + +VARIABLE(grub_uboot_syscall_ptr) + .long 0 @ + + END |