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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2013 Linaro Ltd; <roy.franz@linaro.org>
4 */
5#include <linux/efi.h>
6#include <asm/efi.h>
7
8#include "efistub.h"
9
10static efi_guid_t cpu_state_guid = LINUX_EFI_ARM_CPU_STATE_TABLE_GUID;
11
12struct efi_arm_entry_state *efi_entry_state;
13
14static void get_cpu_state(u32 *cpsr, u32 *sctlr)
15{
16 asm("mrs %0, cpsr" : "=r"(*cpsr));
17 if ((*cpsr & MODE_MASK) == HYP_MODE)
18 asm("mrc p15, 4, %0, c1, c0, 0" : "=r"(*sctlr));
19 else
20 asm("mrc p15, 0, %0, c1, c0, 0" : "=r"(*sctlr));
21}
22
23efi_status_t check_platform_features(void)
24{
25 efi_status_t status;
26 u32 cpsr, sctlr;
27 int block;
28
29 get_cpu_state(&cpsr, &sctlr);
30
31 efi_info("Entering in %s mode with MMU %sabled\n",
32 ((cpsr & MODE_MASK) == HYP_MODE) ? "HYP" : "SVC",
33 (sctlr & 1) ? "en" : "dis");
34
35 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
36 sizeof(*efi_entry_state),
37 (void **)&efi_entry_state);
38 if (status != EFI_SUCCESS) {
39 efi_err("allocate_pool() failed\n");
40 return status;
41 }
42
43 efi_entry_state->cpsr_before_ebs = cpsr;
44 efi_entry_state->sctlr_before_ebs = sctlr;
45
46 status = efi_bs_call(install_configuration_table, &cpu_state_guid,
47 efi_entry_state);
48 if (status != EFI_SUCCESS) {
49 efi_err("install_configuration_table() failed\n");
50 goto free_state;
51 }
52
53 /* non-LPAE kernels can run anywhere */
54 if (!IS_ENABLED(CONFIG_ARM_LPAE))
55 return EFI_SUCCESS;
56
57 /* LPAE kernels need compatible hardware */
58 block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0);
59 if (block < 5) {
60 efi_err("This LPAE kernel is not supported by your CPU\n");
61 status = EFI_UNSUPPORTED;
62 goto drop_table;
63 }
64 return EFI_SUCCESS;
65
66drop_table:
67 efi_bs_call(install_configuration_table, &cpu_state_guid, NULL);
68free_state:
69 efi_bs_call(free_pool, efi_entry_state);
70 return status;
71}
72
73void efi_handle_post_ebs_state(void)
74{
75 get_cpu_state(&efi_entry_state->cpsr_after_ebs,
76 &efi_entry_state->sctlr_after_ebs);
77}
78
79efi_status_t handle_kernel_image(unsigned long *image_addr,
80 unsigned long *image_size,
81 unsigned long *reserve_addr,
82 unsigned long *reserve_size,
83 efi_loaded_image_t *image,
84 efi_handle_t image_handle)
85{
86 const int slack = TEXT_OFFSET - 5 * PAGE_SIZE;
87 int alloc_size = MAX_UNCOMP_KERNEL_SIZE + EFI_PHYS_ALIGN;
88 unsigned long alloc_base, kernel_base;
89 efi_status_t status;
90
91 /*
92 * Allocate space for the decompressed kernel as low as possible.
93 * The region should be 16 MiB aligned, but the first 'slack' bytes
94 * are not used by Linux, so we allow those to be occupied by the
95 * firmware.
96 */
97 status = efi_low_alloc_above(alloc_size, EFI_PAGE_SIZE, &alloc_base, 0x0);
98 if (status != EFI_SUCCESS) {
99 efi_err("Unable to allocate memory for uncompressed kernel.\n");
100 return status;
101 }
102
103 if ((alloc_base % EFI_PHYS_ALIGN) > slack) {
104 /*
105 * More than 'slack' bytes are already occupied at the base of
106 * the allocation, so we need to advance to the next 16 MiB block.
107 */
108 kernel_base = round_up(alloc_base, EFI_PHYS_ALIGN);
109 efi_info("Free memory starts at 0x%lx, setting kernel_base to 0x%lx\n",
110 alloc_base, kernel_base);
111 } else {
112 kernel_base = round_down(alloc_base, EFI_PHYS_ALIGN);
113 }
114
115 *reserve_addr = kernel_base + slack;
116 *reserve_size = MAX_UNCOMP_KERNEL_SIZE;
117
118 /* now free the parts that we will not use */
119 if (*reserve_addr > alloc_base) {
120 efi_bs_call(free_pages, alloc_base,
121 (*reserve_addr - alloc_base) / EFI_PAGE_SIZE);
122 alloc_size -= *reserve_addr - alloc_base;
123 }
124 efi_bs_call(free_pages, *reserve_addr + MAX_UNCOMP_KERNEL_SIZE,
125 (alloc_size - MAX_UNCOMP_KERNEL_SIZE) / EFI_PAGE_SIZE);
126
127 *image_addr = kernel_base + TEXT_OFFSET;
128 *image_size = 0;
129
130 efi_debug("image addr == 0x%lx, reserve_addr == 0x%lx\n",
131 *image_addr, *reserve_addr);
132
133 return EFI_SUCCESS;
134}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2013 Linaro Ltd; <roy.franz@linaro.org>
4 */
5#include <linux/efi.h>
6#include <asm/efi.h>
7
8#include "efistub.h"
9
10static efi_guid_t cpu_state_guid = LINUX_EFI_ARM_CPU_STATE_TABLE_GUID;
11
12struct efi_arm_entry_state *efi_entry_state;
13
14static void get_cpu_state(u32 *cpsr, u32 *sctlr)
15{
16 asm("mrs %0, cpsr" : "=r"(*cpsr));
17 if ((*cpsr & MODE_MASK) == HYP_MODE)
18 asm("mrc p15, 4, %0, c1, c0, 0" : "=r"(*sctlr));
19 else
20 asm("mrc p15, 0, %0, c1, c0, 0" : "=r"(*sctlr));
21}
22
23efi_status_t check_platform_features(void)
24{
25 efi_status_t status;
26 u32 cpsr, sctlr;
27 int block;
28
29 get_cpu_state(&cpsr, &sctlr);
30
31 efi_info("Entering in %s mode with MMU %sabled\n",
32 ((cpsr & MODE_MASK) == HYP_MODE) ? "HYP" : "SVC",
33 (sctlr & 1) ? "en" : "dis");
34
35 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
36 sizeof(*efi_entry_state),
37 (void **)&efi_entry_state);
38 if (status != EFI_SUCCESS) {
39 efi_err("allocate_pool() failed\n");
40 return status;
41 }
42
43 efi_entry_state->cpsr_before_ebs = cpsr;
44 efi_entry_state->sctlr_before_ebs = sctlr;
45
46 status = efi_bs_call(install_configuration_table, &cpu_state_guid,
47 efi_entry_state);
48 if (status != EFI_SUCCESS) {
49 efi_err("install_configuration_table() failed\n");
50 goto free_state;
51 }
52
53 /* non-LPAE kernels can run anywhere */
54 if (!IS_ENABLED(CONFIG_ARM_LPAE))
55 return EFI_SUCCESS;
56
57 /* LPAE kernels need compatible hardware */
58 block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0);
59 if (block < 5) {
60 efi_err("This LPAE kernel is not supported by your CPU\n");
61 status = EFI_UNSUPPORTED;
62 goto drop_table;
63 }
64 return EFI_SUCCESS;
65
66drop_table:
67 efi_bs_call(install_configuration_table, &cpu_state_guid, NULL);
68free_state:
69 efi_bs_call(free_pool, efi_entry_state);
70 return status;
71}
72
73void efi_handle_post_ebs_state(void)
74{
75 get_cpu_state(&efi_entry_state->cpsr_after_ebs,
76 &efi_entry_state->sctlr_after_ebs);
77}
78
79efi_status_t handle_kernel_image(unsigned long *image_addr,
80 unsigned long *image_size,
81 unsigned long *reserve_addr,
82 unsigned long *reserve_size,
83 efi_loaded_image_t *image,
84 efi_handle_t image_handle)
85{
86 const int slack = TEXT_OFFSET - 5 * PAGE_SIZE;
87 int alloc_size = MAX_UNCOMP_KERNEL_SIZE + EFI_PHYS_ALIGN;
88 unsigned long alloc_base, kernel_base;
89 efi_status_t status;
90
91 /*
92 * Allocate space for the decompressed kernel as low as possible.
93 * The region should be 16 MiB aligned, but the first 'slack' bytes
94 * are not used by Linux, so we allow those to be occupied by the
95 * firmware.
96 */
97 status = efi_low_alloc_above(alloc_size, EFI_PAGE_SIZE, &alloc_base, 0x0);
98 if (status != EFI_SUCCESS) {
99 efi_err("Unable to allocate memory for uncompressed kernel.\n");
100 return status;
101 }
102
103 if ((alloc_base % EFI_PHYS_ALIGN) > slack) {
104 /*
105 * More than 'slack' bytes are already occupied at the base of
106 * the allocation, so we need to advance to the next 16 MiB block.
107 */
108 kernel_base = round_up(alloc_base, EFI_PHYS_ALIGN);
109 efi_info("Free memory starts at 0x%lx, setting kernel_base to 0x%lx\n",
110 alloc_base, kernel_base);
111 } else {
112 kernel_base = round_down(alloc_base, EFI_PHYS_ALIGN);
113 }
114
115 *reserve_addr = kernel_base + slack;
116 *reserve_size = MAX_UNCOMP_KERNEL_SIZE;
117
118 /* now free the parts that we will not use */
119 if (*reserve_addr > alloc_base) {
120 efi_bs_call(free_pages, alloc_base,
121 (*reserve_addr - alloc_base) / EFI_PAGE_SIZE);
122 alloc_size -= *reserve_addr - alloc_base;
123 }
124 efi_bs_call(free_pages, *reserve_addr + MAX_UNCOMP_KERNEL_SIZE,
125 (alloc_size - MAX_UNCOMP_KERNEL_SIZE) / EFI_PAGE_SIZE);
126
127 *image_addr = kernel_base + TEXT_OFFSET;
128 *image_size = 0;
129
130 efi_debug("image addr == 0x%lx, reserve_addr == 0x%lx\n",
131 *image_addr, *reserve_addr);
132
133 return EFI_SUCCESS;
134}