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6#include <linux/efi.h>
7#include <linux/libfdt.h>
8
9#include <asm/efi.h>
10#include <asm/sections.h>
11
12#include "efistub.h"
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14
15
16
17
18#ifdef CONFIG_64BIT
19#define MIN_KIMG_ALIGN SZ_2M
20#else
21#define MIN_KIMG_ALIGN SZ_4M
22#endif
23
24typedef void __noreturn (*jump_kernel_func)(unsigned int, unsigned long);
25
26static u32 hartid;
27
28static u32 get_boot_hartid_from_fdt(void)
29{
30 const void *fdt;
31 int chosen_node, len;
32 const fdt32_t *prop;
33
34 fdt = get_efi_config_table(DEVICE_TREE_GUID);
35 if (!fdt)
36 return U32_MAX;
37
38 chosen_node = fdt_path_offset(fdt, "/chosen");
39 if (chosen_node < 0)
40 return U32_MAX;
41
42 prop = fdt_getprop((void *)fdt, chosen_node, "boot-hartid", &len);
43 if (!prop || len != sizeof(u32))
44 return U32_MAX;
45
46 return fdt32_to_cpu(*prop);
47}
48
49efi_status_t check_platform_features(void)
50{
51 hartid = get_boot_hartid_from_fdt();
52 if (hartid == U32_MAX) {
53 efi_err("/chosen/boot-hartid missing or invalid!\n");
54 return EFI_UNSUPPORTED;
55 }
56 return EFI_SUCCESS;
57}
58
59void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt,
60 unsigned long fdt_size)
61{
62 unsigned long stext_offset = _start_kernel - _start;
63 unsigned long kernel_entry = entrypoint + stext_offset;
64 jump_kernel_func jump_kernel = (jump_kernel_func)kernel_entry;
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72 csr_write(CSR_SATP, 0);
73 jump_kernel(hartid, fdt);
74}
75
76efi_status_t handle_kernel_image(unsigned long *image_addr,
77 unsigned long *image_size,
78 unsigned long *reserve_addr,
79 unsigned long *reserve_size,
80 efi_loaded_image_t *image)
81{
82 unsigned long kernel_size = 0;
83 unsigned long preferred_addr;
84 efi_status_t status;
85
86 kernel_size = _edata - _start;
87 *image_addr = (unsigned long)_start;
88 *image_size = kernel_size + (_end - _edata);
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100 preferred_addr = MIN_KIMG_ALIGN;
101 status = efi_relocate_kernel(image_addr, kernel_size, *image_size,
102 preferred_addr, MIN_KIMG_ALIGN, 0x0);
103
104 if (status != EFI_SUCCESS) {
105 efi_err("Failed to relocate kernel\n");
106 *image_size = 0;
107 }
108 return status;
109}
110