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) #define BOOT_CTYPE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include "misc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include "error.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include "../string.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/numa.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <asm/efi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * Longest parameter of 'acpi=' is 'copy_dsdt', plus an extra '\0'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * for termination.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #define MAX_ACPI_ARG_LENGTH 10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * Immovable memory regions representation. Max amount of memory regions is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * MAX_NUMNODES*2.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) struct mem_vector immovable_mem[MAX_NUMNODES*2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * Search EFI system tables for RSDP.  If both ACPI_20_TABLE_GUID and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  * ACPI_TABLE_GUID are found, take the former, which has more features.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) static acpi_physical_address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) __efi_get_rsdp_addr(unsigned long config_tables, unsigned int nr_tables,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 		    bool efi_64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	acpi_physical_address rsdp_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #ifdef CONFIG_EFI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	/* Get EFI tables from systab. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	for (i = 0; i < nr_tables; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		acpi_physical_address table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		efi_guid_t guid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		if (efi_64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 			efi_config_table_64_t *tbl = (efi_config_table_64_t *)config_tables + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 			guid  = tbl->guid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 			table = tbl->table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 			if (!IS_ENABLED(CONFIG_X86_64) && table >> 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 				debug_putstr("Error getting RSDP address: EFI config table located above 4GB.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 				return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 			efi_config_table_32_t *tbl = (efi_config_table_32_t *)config_tables + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 			guid  = tbl->guid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 			table = tbl->table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		if (!(efi_guidcmp(guid, ACPI_TABLE_GUID)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 			rsdp_addr = table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		else if (!(efi_guidcmp(guid, ACPI_20_TABLE_GUID)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 			return table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	return rsdp_addr;
^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) /* EFI/kexec support is 64-bit only. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) #ifdef CONFIG_X86_64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) static struct efi_setup_data *get_kexec_setup_data_addr(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	struct setup_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	u64 pa_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	pa_data = boot_params->hdr.setup_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	while (pa_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		data = (struct setup_data *)pa_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		if (data->type == SETUP_EFI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 			return (struct efi_setup_data *)(pa_data + sizeof(struct setup_data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		pa_data = data->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) static acpi_physical_address kexec_get_rsdp_addr(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	efi_system_table_64_t *systab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	struct efi_setup_data *esd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	struct efi_info *ei;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	char *sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	esd = (struct efi_setup_data *)get_kexec_setup_data_addr();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	if (!esd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	if (!esd->tables) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		debug_putstr("Wrong kexec SETUP_EFI data.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	ei = &boot_params->efi_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	sig = (char *)&ei->efi_loader_signature;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	if (strncmp(sig, EFI64_LOADER_SIGNATURE, 4)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		debug_putstr("Wrong kexec EFI loader signature.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	/* Get systab from boot params. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	systab = (efi_system_table_64_t *) (ei->efi_systab | ((__u64)ei->efi_systab_hi << 32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	if (!systab)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		error("EFI system table not found in kexec boot_params.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	return __efi_get_rsdp_addr((unsigned long)esd->tables, systab->nr_tables, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static acpi_physical_address kexec_get_rsdp_addr(void) { return 0; }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #endif /* CONFIG_X86_64 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) static acpi_physical_address efi_get_rsdp_addr(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) #ifdef CONFIG_EFI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	unsigned long systab, config_tables;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	unsigned int nr_tables;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	struct efi_info *ei;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	bool efi_64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	char *sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	ei = &boot_params->efi_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	sig = (char *)&ei->efi_loader_signature;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	if (!strncmp(sig, EFI64_LOADER_SIGNATURE, 4)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		efi_64 = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	} else if (!strncmp(sig, EFI32_LOADER_SIGNATURE, 4)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		efi_64 = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		debug_putstr("Wrong EFI loader signature.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	/* Get systab from boot params. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) #ifdef CONFIG_X86_64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	systab = ei->efi_systab | ((__u64)ei->efi_systab_hi << 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	if (ei->efi_systab_hi || ei->efi_memmap_hi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		debug_putstr("Error getting RSDP address: EFI system table located above 4GB.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	systab = ei->efi_systab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	if (!systab)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		error("EFI system table not found.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	/* Handle EFI bitness properly */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	if (efi_64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		efi_system_table_64_t *stbl = (efi_system_table_64_t *)systab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		config_tables	= stbl->tables;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		nr_tables	= stbl->nr_tables;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		efi_system_table_32_t *stbl = (efi_system_table_32_t *)systab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		config_tables	= stbl->tables;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		nr_tables	= stbl->nr_tables;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	if (!config_tables)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		error("EFI config tables not found.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	return __efi_get_rsdp_addr(config_tables, nr_tables, efi_64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static u8 compute_checksum(u8 *buffer, u32 length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	u8 *end = buffer + length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	u8 sum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	while (buffer < end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		sum += *(buffer++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	return sum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /* Search a block of memory for the RSDP signature. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) static u8 *scan_mem_for_rsdp(u8 *start, u32 length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	struct acpi_table_rsdp *rsdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	u8 *address, *end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	end = start + length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	/* Search from given start address for the requested length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	for (address = start; address < end; address += ACPI_RSDP_SCAN_STEP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		 * Both RSDP signature and checksum must be correct.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		 * Note: Sometimes there exists more than one RSDP in memory;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		 * the valid RSDP has a valid checksum, all others have an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		 * invalid checksum.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		rsdp = (struct acpi_table_rsdp *)address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		/* BAD Signature */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		if (!ACPI_VALIDATE_RSDP_SIG(rsdp->signature))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		/* Check the standard checksum */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		if (compute_checksum((u8 *)rsdp, ACPI_RSDP_CHECKSUM_LENGTH))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		/* Check extended checksum if table version >= 2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		if ((rsdp->revision >= 2) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		    (compute_checksum((u8 *)rsdp, ACPI_RSDP_XCHECKSUM_LENGTH)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		/* Signature and checksum valid, we have found a real RSDP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		return address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) /* Search RSDP address in EBDA. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) static acpi_physical_address bios_get_rsdp_addr(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	unsigned long address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	u8 *rsdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	/* Get the location of the Extended BIOS Data Area (EBDA) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	address = *(u16 *)ACPI_EBDA_PTR_LOCATION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	address <<= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	 * Search EBDA paragraphs (EBDA is required to be a minimum of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	 * 1K length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	if (address > 0x400) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		rsdp = scan_mem_for_rsdp((u8 *)address, ACPI_EBDA_WINDOW_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		if (rsdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			return (acpi_physical_address)(unsigned long)rsdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	/* Search upper memory: 16-byte boundaries in E0000h-FFFFFh */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	rsdp = scan_mem_for_rsdp((u8 *) ACPI_HI_RSDP_WINDOW_BASE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 					ACPI_HI_RSDP_WINDOW_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (rsdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		return (acpi_physical_address)(unsigned long)rsdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) /* Return RSDP address on success, otherwise 0. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) acpi_physical_address get_rsdp_addr(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	acpi_physical_address pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	pa = boot_params->acpi_rsdp_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	 * Try to get EFI data from setup_data. This can happen when we're a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	 * kexec'ed kernel and kexec(1) has passed all the required EFI info to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	 * us.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	if (!pa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		pa = kexec_get_rsdp_addr();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (!pa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		pa = efi_get_rsdp_addr();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	if (!pa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		pa = bios_get_rsdp_addr();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	return pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) #if defined(CONFIG_RANDOMIZE_BASE) && defined(CONFIG_MEMORY_HOTREMOVE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)  * Max length of 64-bit hex address string is 19, prefix "0x" + 16 hex
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)  * digits, and '\0' for termination.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) #define MAX_ADDR_LEN 19
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static unsigned long get_cmdline_acpi_rsdp(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	unsigned long addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) #ifdef CONFIG_KEXEC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	char val[MAX_ADDR_LEN] = { };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	ret = cmdline_find_option("acpi_rsdp", val, MAX_ADDR_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	if (boot_kstrtoul(val, 16, &addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	return addr;
^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) /* Compute SRAT address from RSDP. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) static unsigned long get_acpi_srat_table(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	unsigned long root_table, acpi_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	struct acpi_table_header *header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	struct acpi_table_rsdp *rsdp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	u32 num_entries, size, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	char arg[10];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	u8 *entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	 * Check whether we were given an RSDP on the command line. We don't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	 * stash this in boot params because the kernel itself may have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	 * different ideas about whether to trust a command-line parameter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	rsdp = (struct acpi_table_rsdp *)get_cmdline_acpi_rsdp();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	if (!rsdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		rsdp = (struct acpi_table_rsdp *)(long)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			boot_params->acpi_rsdp_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	if (!rsdp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	/* Get ACPI root table from RSDP.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	if (!(cmdline_find_option("acpi", arg, sizeof(arg)) == 4 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	    !strncmp(arg, "rsdt", 4)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	    rsdp->xsdt_physical_address &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	    rsdp->revision > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		root_table = rsdp->xsdt_physical_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		size = ACPI_XSDT_ENTRY_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		root_table = rsdp->rsdt_physical_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		size = ACPI_RSDT_ENTRY_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	if (!root_table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	header = (struct acpi_table_header *)root_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	len = header->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	if (len < sizeof(struct acpi_table_header) + size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	num_entries = (len - sizeof(struct acpi_table_header)) / size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	entry = (u8 *)(root_table + sizeof(struct acpi_table_header));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	while (num_entries--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		if (size == ACPI_RSDT_ENTRY_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 			acpi_table = *(u32 *)entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 			acpi_table = *(u64 *)entry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		if (acpi_table) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 			header = (struct acpi_table_header *)acpi_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 			if (ACPI_COMPARE_NAMESEG(header->signature, ACPI_SIG_SRAT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 				return acpi_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		entry += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)  * count_immovable_mem_regions - Parse SRAT and cache the immovable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)  * memory regions into the immovable_mem array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)  * Return the number of immovable memory regions on success, 0 on failure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)  * - Too many immovable memory regions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)  * - ACPI off or no SRAT found
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)  * - No immovable memory region found.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) int count_immovable_mem_regions(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	unsigned long table_addr, table_end, table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	struct acpi_subtable_header *sub_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	struct acpi_table_header *table_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	char arg[MAX_ACPI_ARG_LENGTH];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	int num = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	if (cmdline_find_option("acpi", arg, sizeof(arg)) == 3 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	    !strncmp(arg, "off", 3))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	table_addr = get_acpi_srat_table();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	if (!table_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	table_header = (struct acpi_table_header *)table_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	table_end = table_addr + table_header->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	table = table_addr + sizeof(struct acpi_table_srat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	while (table + sizeof(struct acpi_subtable_header) < table_end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 		sub_table = (struct acpi_subtable_header *)table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 		if (!sub_table->length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 			debug_putstr("Invalid zero length SRAT subtable.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 		if (sub_table->type == ACPI_SRAT_TYPE_MEMORY_AFFINITY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 			struct acpi_srat_mem_affinity *ma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 			ma = (struct acpi_srat_mem_affinity *)sub_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 			if (!(ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && ma->length) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 				immovable_mem[num].start = ma->base_address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 				immovable_mem[num].size = ma->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 				num++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 			if (num >= MAX_NUMNODES*2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 				debug_putstr("Too many immovable memory regions, aborting.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 				return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 		table += sub_table->length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	return num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) #endif /* CONFIG_RANDOMIZE_BASE && CONFIG_MEMORY_HOTREMOVE */