Andrew Jones | 2479ae5 | 2024-01-19 14:23:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | #include <libcflat.h> |
| 3 | #include <devicetree.h> |
| 4 | #include <memregions.h> |
| 5 | |
| 6 | static struct mem_region __initial_mem_regions[NR_INITIAL_MEM_REGIONS + 1]; |
| 7 | static size_t nr_regions = NR_INITIAL_MEM_REGIONS; |
| 8 | |
| 9 | struct mem_region *mem_regions = __initial_mem_regions; |
| 10 | |
| 11 | void memregions_init(struct mem_region regions[], size_t nr) |
| 12 | { |
| 13 | mem_regions = regions; |
| 14 | nr_regions = nr; |
| 15 | } |
| 16 | |
| 17 | struct mem_region *memregions_add(struct mem_region *r) |
| 18 | { |
| 19 | struct mem_region *r_next = mem_regions; |
| 20 | int i = 0; |
| 21 | |
| 22 | for (; r_next->end; ++r_next, ++i) |
| 23 | ; |
| 24 | assert(i < nr_regions); |
| 25 | |
| 26 | *r_next = *r; |
| 27 | |
| 28 | return r_next; |
| 29 | } |
| 30 | |
| 31 | struct mem_region *memregions_find(phys_addr_t paddr) |
| 32 | { |
| 33 | struct mem_region *r; |
| 34 | |
| 35 | for (r = mem_regions; r->end; ++r) |
| 36 | if (paddr >= r->start && paddr < r->end) |
| 37 | return r; |
| 38 | return NULL; |
| 39 | } |
| 40 | |
| 41 | uint32_t memregions_get_flags(phys_addr_t paddr) |
| 42 | { |
| 43 | struct mem_region *r = memregions_find(paddr); |
| 44 | |
| 45 | return r ? r->flags : MR_F_UNKNOWN; |
| 46 | } |
| 47 | |
| 48 | void memregions_split(phys_addr_t addr, struct mem_region **r1, struct mem_region **r2) |
| 49 | { |
| 50 | *r1 = memregions_find(addr); |
| 51 | assert(*r1); |
| 52 | |
| 53 | if ((*r1)->start == addr) { |
| 54 | *r2 = *r1; |
| 55 | *r1 = NULL; |
| 56 | return; |
| 57 | } |
| 58 | |
| 59 | *r2 = memregions_add(&(struct mem_region){ |
| 60 | .start = addr, |
| 61 | .end = (*r1)->end, |
| 62 | .flags = (*r1)->flags, |
| 63 | }); |
| 64 | |
| 65 | (*r1)->end = addr; |
| 66 | } |
| 67 | |
| 68 | void memregions_add_dt_regions(size_t max_nr) |
| 69 | { |
| 70 | struct dt_pbus_reg regs[max_nr]; |
| 71 | int nr_regs, i; |
| 72 | |
| 73 | nr_regs = dt_get_memory_params(regs, max_nr); |
| 74 | assert(nr_regs > 0); |
| 75 | |
| 76 | for (i = 0; i < nr_regs; ++i) { |
| 77 | memregions_add(&(struct mem_region){ |
| 78 | .start = regs[i].addr, |
| 79 | .end = regs[i].addr + regs[i].size, |
| 80 | }); |
| 81 | } |
| 82 | } |
Andrew Jones | fa8e5d6 | 2024-03-05 17:46:38 +0100 | [diff] [blame] | 83 | |
| 84 | #ifdef CONFIG_EFI |
| 85 | /* |
| 86 | * Add memory regions based on the EFI memory map. Also set a pointer to the |
| 87 | * memory region which corresponds to the largest EFI_CONVENTIONAL_MEMORY |
| 88 | * region, as that region is the largest free, continuous region, making it |
| 89 | * a good choice for the memory allocator. |
| 90 | */ |
| 91 | void memregions_efi_init(struct efi_boot_memmap *mem_map, |
| 92 | struct mem_region **freemem) |
| 93 | { |
| 94 | u8 *buffer = (u8 *)*mem_map->map; |
| 95 | u64 freemem_pages = 0; |
| 96 | |
| 97 | *freemem = NULL; |
| 98 | |
| 99 | for (int i = 0; i < *mem_map->map_size; i += *mem_map->desc_size) { |
| 100 | efi_memory_desc_t *d = (efi_memory_desc_t *)&buffer[i]; |
| 101 | struct mem_region r = { |
| 102 | .start = d->phys_addr, |
| 103 | .end = d->phys_addr + d->num_pages * EFI_PAGE_SIZE, |
| 104 | .flags = 0, |
| 105 | }; |
| 106 | |
| 107 | switch (d->type) { |
| 108 | case EFI_MEMORY_MAPPED_IO: |
| 109 | case EFI_MEMORY_MAPPED_IO_PORT_SPACE: |
| 110 | r.flags = MR_F_IO; |
| 111 | break; |
| 112 | case EFI_LOADER_CODE: |
| 113 | r.flags = MR_F_CODE; |
| 114 | break; |
Andrew Jones | 6182cb9 | 2024-03-05 17:46:39 +0100 | [diff] [blame] | 115 | case EFI_LOADER_DATA: |
| 116 | case EFI_ACPI_RECLAIM_MEMORY: |
| 117 | break; |
Andrew Jones | fa8e5d6 | 2024-03-05 17:46:38 +0100 | [diff] [blame] | 118 | case EFI_PERSISTENT_MEMORY: |
| 119 | r.flags = MR_F_PERSISTENT; |
| 120 | break; |
| 121 | case EFI_CONVENTIONAL_MEMORY: |
| 122 | if (freemem_pages < d->num_pages) { |
| 123 | freemem_pages = d->num_pages; |
| 124 | *freemem = memregions_add(&r); |
| 125 | continue; |
| 126 | } |
| 127 | break; |
| 128 | default: |
| 129 | r.flags = MR_F_RESERVED; |
| 130 | break; |
| 131 | } |
| 132 | |
| 133 | memregions_add(&r); |
| 134 | } |
| 135 | } |
| 136 | #endif /* CONFIG_EFI */ |