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)  * Common EFI memory map functions.
^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) #define pr_fmt(fmt) "efi: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/kernel.h>
^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/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <asm/early_ioremap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) static phys_addr_t __init __efi_memmap_alloc_early(unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	return memblock_phys_alloc(size, SMP_CACHE_BYTES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) static phys_addr_t __init __efi_memmap_alloc_late(unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	unsigned int order = get_order(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct page *p = alloc_pages(GFP_KERNEL, order);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	return PFN_PHYS(page_to_pfn(p));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) void __init __efi_memmap_free(u64 phys, unsigned long size, unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	if (flags & EFI_MEMMAP_MEMBLOCK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 		if (slab_is_available())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 			memblock_free_late(phys, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 			memblock_free(phys, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	} else if (flags & EFI_MEMMAP_SLAB) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		struct page *p = pfn_to_page(PHYS_PFN(phys));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		unsigned int order = get_order(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		free_pages((unsigned long) page_address(p), order);
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) static void __init efi_memmap_free(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	__efi_memmap_free(efi.memmap.phys_map,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 			efi.memmap.desc_size * efi.memmap.nr_map,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 			efi.memmap.flags);
^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)  * efi_memmap_alloc - Allocate memory for the EFI memory map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  * @num_entries: Number of entries in the allocated map.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  * @data: efi memmap installation parameters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  * Depending on whether mm_init() has already been invoked or not,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  * either memblock or "normal" page allocation is used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  * Returns the physical address of the allocated memory map on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  * success, zero on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) int __init efi_memmap_alloc(unsigned int num_entries,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		struct efi_memory_map_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	/* Expect allocation parameters are zero initialized */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	WARN_ON(data->phys_map || data->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	data->size = num_entries * efi.memmap.desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	data->desc_version = efi.memmap.desc_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	data->desc_size = efi.memmap.desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	data->flags &= ~(EFI_MEMMAP_SLAB | EFI_MEMMAP_MEMBLOCK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	data->flags |= efi.memmap.flags & EFI_MEMMAP_LATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	if (slab_is_available()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		data->flags |= EFI_MEMMAP_SLAB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		data->phys_map = __efi_memmap_alloc_late(data->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		data->flags |= EFI_MEMMAP_MEMBLOCK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		data->phys_map = __efi_memmap_alloc_early(data->size);
^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) 	if (!data->phys_map)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  * __efi_memmap_init - Common code for mapping the EFI memory map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  * @data: EFI memory map data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94)  * This function takes care of figuring out which function to use to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95)  * map the EFI memory map in efi.memmap based on how far into the boot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  * we are.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98)  * During bootup EFI_MEMMAP_LATE in data->flags should be clear since we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99)  * only have access to the early_memremap*() functions as the vmalloc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)  * space isn't setup.  Once the kernel is fully booted we can fallback
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  * to the more robust memremap*() API.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)  * Returns zero on success, a negative error code on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static int __init __efi_memmap_init(struct efi_memory_map_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	struct efi_memory_map map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	phys_addr_t phys_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	if (efi_enabled(EFI_PARAVIRT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	phys_map = data->phys_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (data->flags & EFI_MEMMAP_LATE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		map.map = memremap(phys_map, data->size, MEMREMAP_WB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		map.map = early_memremap(phys_map, data->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	if (!map.map) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		pr_err("Could not map the memory map!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	/* NOP if data->flags & (EFI_MEMMAP_MEMBLOCK | EFI_MEMMAP_SLAB) == 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	efi_memmap_free();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	map.phys_map = data->phys_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	map.nr_map = data->size / data->desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	map.map_end = map.map + data->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	map.desc_version = data->desc_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	map.desc_size = data->desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	map.flags = data->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	set_bit(EFI_MEMMAP, &efi.flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	efi.memmap = map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  * efi_memmap_init_early - Map the EFI memory map data structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  * @data: EFI memory map data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)  * Use early_memremap() to map the passed in EFI memory map and assign
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)  * it to efi.memmap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) int __init efi_memmap_init_early(struct efi_memory_map_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	/* Cannot go backwards */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	WARN_ON(efi.memmap.flags & EFI_MEMMAP_LATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	data->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	return __efi_memmap_init(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) void __init efi_memmap_unmap(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (!efi_enabled(EFI_MEMMAP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	if (!(efi.memmap.flags & EFI_MEMMAP_LATE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		unsigned long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		size = efi.memmap.desc_size * efi.memmap.nr_map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		early_memunmap(efi.memmap.map, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		memunmap(efi.memmap.map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	efi.memmap.map = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	clear_bit(EFI_MEMMAP, &efi.flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)  * efi_memmap_init_late - Map efi.memmap with memremap()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  * @phys_addr: Physical address of the new EFI memory map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * @size: Size in bytes of the new EFI memory map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  * Setup a mapping of the EFI memory map using ioremap_cache(). This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  * function should only be called once the vmalloc space has been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  * setup and is therefore not suitable for calling during early EFI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)  * initialise, e.g. in efi_init(). Additionally, it expects
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)  * efi_memmap_init_early() to have already been called.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)  * The reason there are two EFI memmap initialisation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)  * (efi_memmap_init_early() and this late version) is because the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)  * early EFI memmap should be explicitly unmapped once EFI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)  * initialisation is complete as the fixmap space used to map the EFI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)  * memmap (via early_memremap()) is a scarce resource.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)  * This late mapping is intended to persist for the duration of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)  * runtime so that things like efi_mem_desc_lookup() and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)  * efi_mem_attributes() always work.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)  * Returns zero on success, a negative error code on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) int __init efi_memmap_init_late(phys_addr_t addr, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	struct efi_memory_map_data data = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		.phys_map = addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		.size = size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		.flags = EFI_MEMMAP_LATE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	/* Did we forget to unmap the early EFI memmap? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	WARN_ON(efi.memmap.map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	/* Were we already called? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	WARN_ON(efi.memmap.flags & EFI_MEMMAP_LATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	 * It makes no sense to allow callers to register different
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	 * values for the following fields. Copy them out of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	 * existing early EFI memmap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	data.desc_version = efi.memmap.desc_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	data.desc_size = efi.memmap.desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return __efi_memmap_init(&data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^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)  * efi_memmap_install - Install a new EFI memory map in efi.memmap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)  * @ctx: map allocation parameters (address, size, flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)  * Unlike efi_memmap_init_*(), this function does not allow the caller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  * to switch from early to late mappings. It simply uses the existing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  * mapping function and installs the new memmap.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  * Returns zero on success, a negative error code on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) int __init efi_memmap_install(struct efi_memory_map_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	efi_memmap_unmap();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	return __efi_memmap_init(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^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)  * efi_memmap_split_count - Count number of additional EFI memmap entries
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)  * @md: EFI memory descriptor to split
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)  * @range: Address range (start, end) to split around
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)  * Returns the number of additional EFI memmap entries required to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)  * accomodate @range.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) int __init efi_memmap_split_count(efi_memory_desc_t *md, struct range *range)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	u64 m_start, m_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	u64 start, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	int count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	start = md->phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	end = start + (md->num_pages << EFI_PAGE_SHIFT) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	/* modifying range */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	m_start = range->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	m_end = range->end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	if (m_start <= start) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		/* split into 2 parts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		if (start < m_end && m_end < end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	if (start < m_start && m_start < end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		/* split into 3 parts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		if (m_end < end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 			count += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		/* split into 2 parts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		if (end <= m_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)  * efi_memmap_insert - Insert a memory region in an EFI memmap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)  * @old_memmap: The existing EFI memory map structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)  * @buf: Address of buffer to store new map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)  * @mem: Memory map entry to insert
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)  * It is suggested that you call efi_memmap_split_count() first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)  * to see how large @buf needs to be.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) void __init efi_memmap_insert(struct efi_memory_map *old_memmap, void *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 			      struct efi_mem_range *mem)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	u64 m_start, m_end, m_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	efi_memory_desc_t *md;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	u64 start, end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	void *old, *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	/* modifying range */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	m_start = mem->range.start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	m_end = mem->range.end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	m_attr = mem->attribute;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	 * The EFI memory map deals with regions in EFI_PAGE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	 * units. Ensure that the region described by 'mem' is aligned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	 * correctly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	if (!IS_ALIGNED(m_start, EFI_PAGE_SIZE) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	    !IS_ALIGNED(m_end + 1, EFI_PAGE_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		WARN_ON(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	for (old = old_memmap->map, new = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	     old < old_memmap->map_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	     old += old_memmap->desc_size, new += old_memmap->desc_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		/* copy original EFI memory descriptor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		memcpy(new, old, old_memmap->desc_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		md = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		start = md->phys_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		if (m_start <= start && end <= m_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 			md->attribute |= m_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		if (m_start <= start &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		    (start < m_end && m_end < end)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 			/* first part */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 			md->attribute |= m_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 			md->num_pages = (m_end - md->phys_addr + 1) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 				EFI_PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 			/* latter part */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 			new += old_memmap->desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 			memcpy(new, old, old_memmap->desc_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 			md = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 			md->phys_addr = m_end + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 			md->num_pages = (end - md->phys_addr + 1) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 				EFI_PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		if ((start < m_start && m_start < end) && m_end < end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 			/* first part */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 			md->num_pages = (m_start - md->phys_addr) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 				EFI_PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 			/* middle part */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 			new += old_memmap->desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 			memcpy(new, old, old_memmap->desc_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 			md = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 			md->attribute |= m_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 			md->phys_addr = m_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 			md->num_pages = (m_end - m_start + 1) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 				EFI_PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 			/* last part */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 			new += old_memmap->desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 			memcpy(new, old, old_memmap->desc_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 			md = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 			md->phys_addr = m_end + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 			md->num_pages = (end - m_end) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 				EFI_PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		if ((start < m_start && m_start < end) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		    (end <= m_end)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 			/* first part */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 			md->num_pages = (m_start - md->phys_addr) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 				EFI_PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 			/* latter part */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 			new += old_memmap->desc_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 			memcpy(new, old, old_memmap->desc_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 			md = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 			md->phys_addr = m_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 			md->num_pages = (end - md->phys_addr + 1) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 				EFI_PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 			md->attribute |= m_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }