Orange Pi5 kernel

^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)  * FDT related Helper functions used by the EFI stub on multiple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * architectures. This should be #included by the EFI stub
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * implementation files.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright 2013 Linaro Limited; author Roy Franz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/libfdt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <asm/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include "efistub.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #define EFI_DT_ADDR_CELLS_DEFAULT 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #define EFI_DT_SIZE_CELLS_DEFAULT 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) static void fdt_update_cell_size(void *fdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	int offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	offset = fdt_path_offset(fdt, "/");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	/* Set the #address-cells and #size-cells values for an empty tree */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	fdt_setprop_u32(fdt, offset, "#address-cells", EFI_DT_ADDR_CELLS_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	fdt_setprop_u32(fdt, offset, "#size-cells",    EFI_DT_SIZE_CELLS_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static efi_status_t update_fdt(void *orig_fdt, unsigned long orig_fdt_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 			       void *fdt, int new_fdt_size, char *cmdline_ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 			       u64 initrd_addr, u64 initrd_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	int node, num_rsv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	u32 fdt_val32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	u64 fdt_val64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	/* Do some checks on provided FDT, if it exists: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	if (orig_fdt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		if (fdt_check_header(orig_fdt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 			efi_err("Device Tree header not valid!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 			return EFI_LOAD_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 		 * We don't get the size of the FDT if we get if from a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		 * configuration table:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 			efi_err("Truncated device tree! foo!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 			return EFI_LOAD_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	if (orig_fdt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		status = fdt_open_into(orig_fdt, fdt, new_fdt_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		status = fdt_create_empty_tree(fdt, new_fdt_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		if (status == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 			 * Any failure from the following function is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 			 * non-critical:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 			fdt_update_cell_size(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	if (status != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		goto fdt_set_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	 * Delete all memory reserve map entries. When booting via UEFI,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	 * kernel will use the UEFI memory map to find reserved regions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	num_rsv = fdt_num_mem_rsv(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	while (num_rsv-- > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		fdt_del_mem_rsv(fdt, num_rsv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	node = fdt_subnode_offset(fdt, 0, "chosen");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	if (node < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		node = fdt_add_subnode(fdt, 0, "chosen");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		if (node < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			/* 'node' is an error code when negative: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			status = node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			goto fdt_set_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (cmdline_ptr != NULL && strlen(cmdline_ptr) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 				     strlen(cmdline_ptr) + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		if (status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			goto fdt_set_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	/* Set initrd address/end in device tree, if present */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	if (initrd_size != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		u64 initrd_image_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		u64 initrd_image_start = cpu_to_fdt64(initrd_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		status = fdt_setprop_var(fdt, node, "linux,initrd-start", initrd_image_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		if (status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			goto fdt_set_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		initrd_image_end = cpu_to_fdt64(initrd_addr + initrd_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		status = fdt_setprop_var(fdt, node, "linux,initrd-end", initrd_image_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		if (status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			goto fdt_set_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	/* Add FDT entries for EFI runtime services in chosen node. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	node = fdt_subnode_offset(fdt, 0, "chosen");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	fdt_val64 = cpu_to_fdt64((u64)(unsigned long)efi_system_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	status = fdt_setprop_var(fdt, node, "linux,uefi-system-table", fdt_val64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		goto fdt_set_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	fdt_val64 = U64_MAX; /* placeholder */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-start", fdt_val64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		goto fdt_set_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	fdt_val32 = U32_MAX; /* placeholder */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-size", fdt_val32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		goto fdt_set_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-desc-size", fdt_val32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	if (status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		goto fdt_set_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-desc-ver", fdt_val32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	if (status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		goto fdt_set_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && !efi_nokaslr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		efi_status_t efi_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		efi_status = efi_get_random_bytes(sizeof(fdt_val64),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 						  (u8 *)&fdt_val64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		if (efi_status == EFI_SUCCESS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			status = fdt_setprop_var(fdt, node, "kaslr-seed", fdt_val64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			if (status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 				goto fdt_set_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	/* Shrink the FDT back to its minimum size: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	fdt_pack(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	return EFI_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) fdt_set_fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (status == -FDT_ERR_NOSPACE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		return EFI_BUFFER_TOO_SMALL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	return EFI_LOAD_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static efi_status_t update_fdt_memmap(void *fdt, struct efi_boot_memmap *map)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	int node = fdt_path_offset(fdt, "/chosen");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	u64 fdt_val64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	u32 fdt_val32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	if (node < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		return EFI_LOAD_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	fdt_val64 = cpu_to_fdt64((unsigned long)*map->map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-start", fdt_val64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		return EFI_LOAD_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	fdt_val32 = cpu_to_fdt32(*map->map_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-size", fdt_val32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		return EFI_LOAD_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	fdt_val32 = cpu_to_fdt32(*map->desc_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-desc-size", fdt_val32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		return EFI_LOAD_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	fdt_val32 = cpu_to_fdt32(*map->desc_ver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-desc-ver", fdt_val32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		return EFI_LOAD_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	return EFI_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) struct exit_boot_struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	efi_memory_desc_t	*runtime_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	int			*runtime_entry_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	void			*new_fdt_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 				   void *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	struct exit_boot_struct *p = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	 * Update the memory map with virtual addresses. The function will also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	 * populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	 * entries so that we can pass it straight to SetVirtualAddressMap()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	efi_get_virtmap(*map->map, *map->map_size, *map->desc_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 			p->runtime_map, p->runtime_entry_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	return update_fdt_memmap(p->new_fdt_addr, map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) #ifndef MAX_FDT_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) # define MAX_FDT_SIZE SZ_2M
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)  * Allocate memory for a new FDT, then add EFI, commandline, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)  * initrd related fields to the FDT.  This routine increases the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)  * FDT allocation size until the allocated memory is large
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)  * enough.  EFI allocations are in EFI_PAGE_SIZE granules,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  * which are fixed at 4K bytes, so in most cases the first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  * allocation should succeed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)  * EFI boot services are exited at the end of this function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  * There must be no allocations between the get_memory_map()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)  * call and the exit_boot_services() call, so the exiting of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)  * boot services is very tightly tied to the creation of the FDT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)  * with the final memory map in it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 					    unsigned long *new_fdt_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 					    unsigned long max_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 					    u64 initrd_addr, u64 initrd_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 					    char *cmdline_ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 					    unsigned long fdt_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 					    unsigned long fdt_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	unsigned long map_size, desc_size, buff_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	u32 desc_ver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	unsigned long mmap_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	efi_memory_desc_t *memory_map, *runtime_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	efi_status_t status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	int runtime_entry_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	struct efi_boot_memmap map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	struct exit_boot_struct priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	map.map		= &runtime_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	map.map_size	= &map_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	map.desc_size	= &desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	map.desc_ver	= &desc_ver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	map.key_ptr	= &mmap_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	map.buff_size	= &buff_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	 * Get a copy of the current memory map that we will use to prepare
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	 * the input for SetVirtualAddressMap(). We don't have to worry about
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	 * subsequent allocations adding entries, since they could not affect
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	 * the number of EFI_MEMORY_RUNTIME regions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	status = efi_get_memory_map(&map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	if (status != EFI_SUCCESS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		efi_err("Unable to retrieve UEFI memory map.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	efi_info("Exiting boot services and installing virtual address map...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	map.map = &memory_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	status = efi_allocate_pages(MAX_FDT_SIZE, new_fdt_addr, max_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	if (status != EFI_SUCCESS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		efi_err("Unable to allocate memory for new device tree.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	 * Now that we have done our final memory allocation (and free)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	 * we can get the memory map key needed for exit_boot_services().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	status = efi_get_memory_map(&map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	if (status != EFI_SUCCESS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		goto fail_free_new_fdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	status = update_fdt((void *)fdt_addr, fdt_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 			    (void *)*new_fdt_addr, MAX_FDT_SIZE, cmdline_ptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 			    initrd_addr, initrd_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	if (status != EFI_SUCCESS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		efi_err("Unable to construct new device tree.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		goto fail_free_new_fdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	runtime_entry_count		= 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	priv.runtime_map		= runtime_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	priv.runtime_entry_count	= &runtime_entry_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	priv.new_fdt_addr		= (void *)*new_fdt_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	if (status == EFI_SUCCESS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		efi_set_virtual_address_map_t *svam;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		if (efi_novamap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 			return EFI_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		/* Install the new virtual address map */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		svam = efi_system_table->runtime->set_virtual_address_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		status = svam(runtime_entry_count * desc_size, desc_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 			      desc_ver, runtime_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		 * We are beyond the point of no return here, so if the call to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		 * SetVirtualAddressMap() failed, we need to signal that to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		 * incoming kernel but proceed normally otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		if (status != EFI_SUCCESS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 			int l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 			 * Set the virtual address field of all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 			 * EFI_MEMORY_RUNTIME entries to 0. This will signal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 			 * the incoming kernel that no virtual translation has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 			 * been installed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 			for (l = 0; l < map_size; l += desc_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 				efi_memory_desc_t *p = (void *)memory_map + l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 				if (p->attribute & EFI_MEMORY_RUNTIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 					p->virt_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		return EFI_SUCCESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	efi_err("Exit boot services failed.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) fail_free_new_fdt:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	efi_free(MAX_FDT_SIZE, *new_fdt_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	efi_system_table->boottime->free_pool(runtime_map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	return EFI_LOAD_ERROR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) void *get_fdt(unsigned long *fdt_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	void *fdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	fdt = get_efi_config_table(DEVICE_TREE_GUID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	if (!fdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	if (fdt_check_header(fdt) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		efi_err("Invalid header detected on UEFI supplied FDT, ignoring ...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	*fdt_size = fdt_totalsize(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	return fdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }