src/include/bootmem.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef BOOTMEM_H
   4 #define BOOTMEM_H
   5
   6 #include <boot/coreboot_tables.h>
   7 #include <memrange.h>
   8 #include <types.h>
   9
  10 /**
  11  * Bootmem types match to LB_MEM tags, except for the following:
  12  * BM_MEM_RAMSTAGE : Memory where any kind of boot firmware resides and that
  13  *                   should not be touched by bootmem (by example: stack,
  14  *                   TTB, program, ...).
  15  * BM_MEM_PAYLOAD  : Memory where any kind of payload resides and that should
  16  *                   not be touched by bootmem.
  17  * Start at 0x10000 to make sure that the caller doesn't provide LB_MEM tags.
  18  */
  19 enum bootmem_type {
  20         BM_MEM_INVALID = 0,     /* Invalid type (used in optional arguments). */
  21
  22         BM_MEM_FIRST = 0x10000, /* First entry in this list */
  23         BM_MEM_RAM,             /* Memory anyone can use */
  24         BM_MEM_RESERVED,        /* Don't use this memory region */
  25         BM_MEM_ACPI,            /* ACPI Tables */
  26         BM_MEM_NVS,             /* ACPI NVS Memory */
  27         BM_MEM_UNUSABLE,        /* Unusable address space */
  28         BM_MEM_VENDOR_RSVD,     /* Vendor Reserved */
  29         BM_MEM_OPENSBI,         /* Risc-V OpenSBI */
  30         BM_MEM_BL31,            /* Arm64 BL31 executable */
  31         BM_MEM_TABLE,           /* Ram configuration tables are kept in */
  32         /* Tags below this point are ignored for the OS table. */
  33         BM_MEM_OS_CUTOFF = BM_MEM_TABLE,
  34         BM_MEM_RAMSTAGE,
  35         BM_MEM_PAYLOAD,
  36         BM_MEM_LAST,            /* Last entry in this list */
  37 };
  38
  39 /**
  40  * Write memory coreboot table. Current resource map is serialized into
  41  * memtable (LB_MEM_* types). bootmem library is unusable until this function
  42  * is called first in the write tables path before payload is loaded.
  43  *
  44  * Bootmem types match to LB_MEM tags, except for the following:
  45  * BM_MEM_RAMSTAGE : Translates to LB_MEM_RAM.
  46  * BM_MEM_PAYLOAD  : Translates to LB_MEM_RAM.
  47  * BM_MEM_BL31     : Translates to LB_MEM_RESERVED.
  48  */
  49 void bootmem_write_memory_table(struct lb_memory *mem);
  50
  51 /* Architecture hook to add bootmem areas the architecture controls when
  52  * bootmem_write_memory_table() is called. */
  53 void bootmem_arch_add_ranges(void);
  54
  55 /* Platform hook to add bootmem areas the platform / board controls. */
  56 void bootmem_platform_add_ranges(void);
  57
  58 /* Add a range of a given type to the bootmem address space. */
  59 void bootmem_add_range(uint64_t start, uint64_t size,
  60                        const enum bootmem_type tag);
  61
  62 /* Print current range map of boot memory. */
  63 void bootmem_dump_ranges(void);
  64
  65 typedef bool (*range_action_t)(const struct range_entry *r, void *arg);
  66
  67 /**
  68  * Walk memory tables from OS point of view and call the provided function,
  69  * for every region. The caller has to return false to break out of the loop any
  70  * time, or return true to continue.
  71  *
  72  * @param action The function to call for each memory range.
  73  * @param arg Pointer passed to function @action. Set to NULL if unused.
  74  * @return true if the function 'action' returned false.
  75  */
  76 bool bootmem_walk_os_mem(range_action_t action, void *arg);
  77
  78 /**
  79  * Walk memory tables and call the provided function, for every region.
  80  * The caller has to return false to break out of the loop any time, or
  81  * return true to continue.
  82  *
  83  * @param action The function to call for each memory range.
  84  * @param arg Pointer passed to function @action. Set to NULL if unused.
  85  * @return true if the function 'action' returned false.
  86  */
  87 bool bootmem_walk(range_action_t action, void *arg);
  88
  89 /* Returns 1 if the requested memory range is all tagged as type dest_type.
  90  * Otherwise returns 0.
  91  */
  92 int bootmem_region_targets_type(uint64_t start, uint64_t size,
  93                 enum bootmem_type dest_type);
  94
  95 /* Allocate a temporary buffer from the unused RAM areas. */
  96 void *bootmem_allocate_buffer(size_t size);
  97
  98 #endif /* BOOTMEM_H */