99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 Western Digital Corporation or its affiliates.
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*/
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#include <linux/efi.h>
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#include <linux/libfdt.h>
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#include <asm/efi.h>
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#include <asm/unaligned.h>
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#include "efistub.h"
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typedef void __noreturn (*jump_kernel_func)(unsigned long, unsigned long);
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static unsigned long hartid;
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static int get_boot_hartid_from_fdt(void)
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{
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const void *fdt;
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int chosen_node, len;
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const void *prop;
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fdt = get_efi_config_table(DEVICE_TREE_GUID);
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if (!fdt)
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return -EINVAL;
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chosen_node = fdt_path_offset(fdt, "/chosen");
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if (chosen_node < 0)
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return -EINVAL;
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prop = fdt_getprop((void *)fdt, chosen_node, "boot-hartid", &len);
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if (!prop)
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return -EINVAL;
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if (len == sizeof(u32))
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hartid = (unsigned long) fdt32_to_cpu(*(fdt32_t *)prop);
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else if (len == sizeof(u64))
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hartid = (unsigned long) fdt64_to_cpu(__get_unaligned_t(fdt64_t, prop));
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else
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return -EINVAL;
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return 0;
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}
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static efi_status_t get_boot_hartid_from_efi(void)
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{
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efi_guid_t boot_protocol_guid = RISCV_EFI_BOOT_PROTOCOL_GUID;
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struct riscv_efi_boot_protocol *boot_protocol;
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efi_status_t status;
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status = efi_bs_call(locate_protocol, &boot_protocol_guid, NULL,
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(void **)&boot_protocol);
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if (status != EFI_SUCCESS)
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return status;
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return efi_call_proto(boot_protocol, get_boot_hartid, &hartid);
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}
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efi_status_t check_platform_features(void)
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{
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efi_status_t status;
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int ret;
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status = get_boot_hartid_from_efi();
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if (status != EFI_SUCCESS) {
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ret = get_boot_hartid_from_fdt();
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if (ret) {
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efi_err("Failed to get boot hartid!\n");
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return EFI_UNSUPPORTED;
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}
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}
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return EFI_SUCCESS;
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}
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unsigned long __weak stext_offset(void)
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{
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/*
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* This fallback definition is used by the EFI zboot stub, which loads
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* the entire image so it can branch via the image header at offset #0.
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*/
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return 0;
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}
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void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt,
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unsigned long fdt_size)
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{
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unsigned long kernel_entry = entrypoint + stext_offset();
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jump_kernel_func jump_kernel = (jump_kernel_func)kernel_entry;
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/*
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* Jump to real kernel here with following constraints.
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* 1. MMU should be disabled.
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* 2. a0 should contain hartid
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* 3. a1 should DT address
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*/
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csr_write(CSR_SATP, 0);
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jump_kernel(hartid, fdt);
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}
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