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https://github.com/AsahiLinux/u-boot
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78ac2c0fd0
There's now a sun20i family in sunxi, which uses RISC-V CPU. Add support for making eGON.BT0 image for RISC-V. Reviewed-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Icenowy Zheng <icenowy@aosc.io> Signed-off-by: Samuel Holland <samuel@sholland.org> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
198 lines
5.2 KiB
C
198 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2018 Arm Ltd.
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*/
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#include "imagetool.h"
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#include <image.h>
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#include <sunxi_image.h>
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/*
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* NAND requires 8K padding. SD/eMMC gets away with 512 bytes,
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* but let's use the larger padding by default to cover both.
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*/
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#define PAD_SIZE 8192
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#define PAD_SIZE_MIN 512
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static int egon_get_arch(struct image_tool_params *params)
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{
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if (params->Aflag)
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return params->arch;
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/* For compatibility, assume ARM when no architecture specified */
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return IH_ARCH_ARM;
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}
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static int egon_check_params(struct image_tool_params *params)
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{
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/*
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* Check whether the architecture is supported.
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*/
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switch (egon_get_arch(params)) {
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case IH_ARCH_ARM:
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case IH_ARCH_RISCV:
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break;
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default:
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return EXIT_FAILURE;
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}
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/* We need a binary image file. */
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return !params->dflag;
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}
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static int egon_verify_header(unsigned char *ptr, int image_size,
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struct image_tool_params *params)
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{
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const struct boot_file_head *header = (void *)ptr;
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uint32_t length;
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/*
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* First 4 bytes must be a branch instruction of the corresponding
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* architecture.
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*/
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switch (egon_get_arch(params)) {
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case IH_ARCH_ARM:
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if ((le32_to_cpu(header->b_instruction) & 0xff000000) != 0xea000000)
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return EXIT_FAILURE;
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break;
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case IH_ARCH_RISCV:
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if ((le32_to_cpu(header->b_instruction) & 0x00000fff) != 0x0000006f)
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return EXIT_FAILURE;
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break;
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default:
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return EXIT_FAILURE; /* Unknown architecture */
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}
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if (memcmp(header->magic, BOOT0_MAGIC, sizeof(header->magic)))
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return EXIT_FAILURE;
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length = le32_to_cpu(header->length);
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/* Must be at least 512 byte aligned. */
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if (length & 511)
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return EXIT_FAILURE;
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/*
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* Image could also contain U-Boot proper, so could be bigger.
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* But it must not be shorter.
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*/
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if (image_size < length)
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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}
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static void egon_print_header(const void *buf)
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{
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const struct boot_file_head *header = buf;
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printf("Allwinner eGON image, size: %d bytes\n",
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le32_to_cpu(header->length));
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if (memcmp(header->spl_signature, SPL_SIGNATURE, 3))
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return;
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printf("\tSPL header version %d.%d\n",
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header->spl_signature[3] >> SPL_MINOR_BITS,
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header->spl_signature[3] & ((1U << SPL_MINOR_BITS) - 1));
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if (header->spl_signature[3] >= SPL_DT_HEADER_VERSION) {
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uint32_t dt_name_offs = le32_to_cpu(header->dt_name_offset);
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if (dt_name_offs > 0)
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printf("\tDT name: %s\n", (char *)buf + dt_name_offs);
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}
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}
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static void egon_set_header(void *buf, struct stat *sbuf, int infd,
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struct image_tool_params *params)
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{
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struct boot_file_head *header = buf;
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uint32_t *buf32 = buf;
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uint32_t checksum = 0, value;
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int i;
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/*
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* Different architectures need different first instruction to
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* branch to the body.
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*/
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switch (egon_get_arch(params)) {
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case IH_ARCH_ARM:
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/* Generate an ARM branch instruction to jump over the header. */
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value = 0xea000000 | (sizeof(struct boot_file_head) / 4 - 2);
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header->b_instruction = cpu_to_le32(value);
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break;
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case IH_ARCH_RISCV:
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/*
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* Generate a RISC-V JAL instruction with rd=x0
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* (pseudo instruction J, jump without side effects).
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*
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* The following weird bit operation maps imm[20]
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* to inst[31], imm[10:1] to inst[30:21],
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* imm[11] to inst[20], imm[19:12] to inst[19:12],
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* and imm[0] is dropped (because 1-byte RISC-V instruction
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* is not allowed).
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*/
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value = 0x0000006f |
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((sizeof(struct boot_file_head) & 0x00100000) << 11) |
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((sizeof(struct boot_file_head) & 0x000007fe) << 20) |
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((sizeof(struct boot_file_head) & 0x00000800) << 9) |
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((sizeof(struct boot_file_head) & 0x000ff000) << 0);
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header->b_instruction = cpu_to_le32(value);
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break;
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}
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memcpy(header->magic, BOOT0_MAGIC, sizeof(header->magic));
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header->check_sum = cpu_to_le32(BROM_STAMP_VALUE);
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header->length = cpu_to_le32(params->file_size);
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memcpy(header->spl_signature, SPL_SIGNATURE, 3);
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header->spl_signature[3] = SPL_ENV_HEADER_VERSION;
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/* If an image name has been provided, use it as the DT name. */
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if (params->imagename && params->imagename[0]) {
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if (strlen(params->imagename) > sizeof(header->string_pool) - 1)
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printf("WARNING: DT name too long for SPL header!\n");
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else {
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strcpy((char *)header->string_pool, params->imagename);
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value = offsetof(struct boot_file_head, string_pool);
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header->dt_name_offset = cpu_to_le32(value);
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header->spl_signature[3] = SPL_DT_HEADER_VERSION;
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}
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}
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/* Calculate the checksum. Yes, it's that simple. */
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for (i = 0; i < sbuf->st_size / 4; i++)
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checksum += le32_to_cpu(buf32[i]);
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header->check_sum = cpu_to_le32(checksum);
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}
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static int egon_check_image_type(uint8_t type)
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{
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return type == IH_TYPE_SUNXI_EGON ? 0 : 1;
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}
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static int egon_vrec_header(struct image_tool_params *params,
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struct image_type_params *tparams)
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{
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int pad_size = ALIGN(params->bl_len ?: PAD_SIZE, PAD_SIZE_MIN);
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tparams->hdr = calloc(sizeof(struct boot_file_head), 1);
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/* Return padding to complete blocks. */
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return ALIGN(params->file_size, pad_size) - params->file_size;
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}
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U_BOOT_IMAGE_TYPE(
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sunxi_egon,
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"Allwinner eGON Boot Image support",
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sizeof(struct boot_file_head),
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NULL,
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egon_check_params,
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egon_verify_header,
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egon_print_header,
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egon_set_header,
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NULL,
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egon_check_image_type,
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NULL,
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egon_vrec_header
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);
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