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author | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
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committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/vbootrom/image.c | |
parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/vbootrom/image.c')
-rw-r--r-- | roms/vbootrom/image.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/roms/vbootrom/image.c b/roms/vbootrom/image.c new file mode 100644 index 000000000..08fe3f504 --- /dev/null +++ b/roms/vbootrom/image.c @@ -0,0 +1,118 @@ +/* + * Boot image parsing and loading. + * + * Copyright 2020 Google LLC + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <stdint.h> + +#define SPI0CS0 0x80000000 +#define GCR 0xf0800000 +#define CLK 0xf0801000 +#define FIU0 0xfb000000 + +#define CLK_CLKDIV3 0x58 + +#define FIU_DRD_CFG 0x00 +#define FIU_CFG 0x78 + +#define BOOT_MAGIC0 0x000 +#define BOOT_MAGIC1 0x004 +#define BOOT_FIU_DRD_CFG 0x108 +#define BOOT_FIU_CLK_DIV 0x10c +#define BOOT_DEST_ADDR 0x140 +#define BOOT_CODE_SIZE 0x144 +#define BOOT_VERSION 0x148 +#define BOOT_CODE_OFFSET 0x200 + +#define BOOT_MAGIC0_VALUE 0xaa550750 +#define BOOT_MAGIC1_VALUE 0x424f4f54 + +/* + * This structure must reside at offset 0x100 in SRAM. + * + * See the Check_ROMCode_Status function in the Nuvoton bootblock: + * https://github.com/Nuvoton-Israel/bootblock/blob/master/Src/bootblock_main.c#L795 + */ +struct rom_status { + uint8_t reserved[12]; + uint8_t start_tag[8]; + uint32_t status; +} rom_status __attribute__((section(".data.rom_status"))) = { + .status = 0x21, /* SPI0 CS0 offset 0 */ +}; + +extern void panic(const char *); + +static void reg_write(uintptr_t base, uintptr_t offset, uint32_t value) +{ + asm volatile("str %0, [%1, %2]" + : + : "r"(value), "r"(base), "i"(offset) + : "memory"); +} + +static uint32_t image_read_u8(uintptr_t base, uintptr_t offset) +{ + return *(uint8_t *)(base + offset); +} + +static uint32_t image_read_u32(uintptr_t base, uintptr_t offset) +{ + return *(uint32_t *)(base + offset); +} + +void copy_boot_image(uintptr_t dest_addr, uintptr_t src_addr, int32_t len) +{ + uint32_t *dst = (uint32_t *)dest_addr; + uint32_t *src = (uint32_t *)src_addr; + + while (len > 0) { + *dst++ = *src++; + len -= sizeof(*dst); + } +} + +uintptr_t load_boot_image(void) +{ + uintptr_t dest_addr; + uint32_t drd_cfg; + uint8_t clk_div; + + reg_write(FIU0, FIU_CFG, 0x0000000b); + + if (image_read_u32(SPI0CS0, BOOT_MAGIC0) != BOOT_MAGIC0_VALUE) { + panic("Bad image magic0 value"); + } + if (image_read_u32(SPI0CS0, BOOT_MAGIC1) != BOOT_MAGIC1_VALUE) { + panic("Bad image magic1 value"); + } + + clk_div = image_read_u8(SPI0CS0, BOOT_FIU_CLK_DIV); + if (clk_div != 0) { + reg_write(FIU0, FIU_DRD_CFG, image_read_u32(SPI0CS0, BOOT_FIU_DRD_CFG)); + reg_write(CLK, CLK_CLKDIV3, clk_div << 6); + } + + dest_addr = image_read_u32(SPI0CS0, BOOT_DEST_ADDR); + if (dest_addr == 0) { + return SPI0CS0 + 0x200; + } + + copy_boot_image(dest_addr, SPI0CS0, + image_read_u32(SPI0CS0, BOOT_CODE_SIZE) + 0x200); + + return dest_addr + 0x200; +} |