^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2020 Western Digital Corporation or its affiliates.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/libfdt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <asm/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "efistub.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * RISC-V requires the kernel image to placed 2 MB aligned base for 64 bit and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * 4MB for 32 bit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #ifdef CONFIG_64BIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define MIN_KIMG_ALIGN SZ_2M
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define MIN_KIMG_ALIGN SZ_4M
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) typedef void __noreturn (*jump_kernel_func)(unsigned int, unsigned long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static u32 hartid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static int get_boot_hartid_from_fdt(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) const void *fdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) int chosen_node, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) const fdt32_t *prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) fdt = get_efi_config_table(DEVICE_TREE_GUID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (!fdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) chosen_node = fdt_path_offset(fdt, "/chosen");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) if (chosen_node < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) prop = fdt_getprop((void *)fdt, chosen_node, "boot-hartid", &len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (!prop || len != sizeof(u32))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) hartid = fdt32_to_cpu(*prop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) efi_status_t check_platform_features(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) ret = get_boot_hartid_from_fdt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) efi_err("/chosen/boot-hartid missing or invalid!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return EFI_UNSUPPORTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return EFI_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) unsigned long fdt_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) unsigned long stext_offset = _start_kernel - _start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) unsigned long kernel_entry = entrypoint + stext_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) jump_kernel_func jump_kernel = (jump_kernel_func)kernel_entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * Jump to real kernel here with following constraints.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * 1. MMU should be disabled.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * 2. a0 should contain hartid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * 3. a1 should DT address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) csr_write(CSR_SATP, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) jump_kernel(hartid, fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) efi_status_t handle_kernel_image(unsigned long *image_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) unsigned long *image_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) unsigned long *reserve_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) unsigned long *reserve_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) efi_loaded_image_t *image)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) unsigned long kernel_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) unsigned long preferred_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) efi_status_t status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) kernel_size = _edata - _start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) *image_addr = (unsigned long)_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) *image_size = kernel_size + (_end - _edata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * RISC-V kernel maps PAGE_OFFSET virtual address to the same physical
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * address where kernel is booted. That's why kernel should boot from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * as low as possible to avoid wastage of memory. Currently, dram_base
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * is occupied by the firmware. So the preferred address for kernel to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * boot is next aligned address. If preferred address is not available,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * relocate_kernel will fall back to efi_low_alloc_above to allocate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * lowest possible memory region as long as the address and size meets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * the alignment constraints.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) preferred_addr = MIN_KIMG_ALIGN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) status = efi_relocate_kernel(image_addr, kernel_size, *image_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) preferred_addr, MIN_KIMG_ALIGN, 0x0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (status != EFI_SUCCESS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) efi_err("Failed to relocate kernel\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) *image_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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