diff options
Diffstat (limited to 'arch/x86/lib/e820.c')
| -rw-r--r-- | arch/x86/lib/e820.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/x86/lib/e820.c b/arch/x86/lib/e820.c index 00ca94776d2..bcc5f6f3044 100644 --- a/arch/x86/lib/e820.c +++ b/arch/x86/lib/e820.c @@ -3,8 +3,11 @@ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com> */ +#define LOG_CATEGORY LOGC_ARCH + #include <efi_loader.h> #include <lmb.h> +#include <log.h> #include <asm/e820.h> #include <asm/global_data.h> @@ -60,6 +63,50 @@ __weak unsigned int install_e820_map(unsigned int max_entries, return 4; } +void e820_init(struct e820_ctx *ctx, struct e820_entry *entries, + int max_entries) +{ + memset(ctx, '\0', sizeof(*ctx)); + ctx->entries = entries; + ctx->max_entries = max_entries; +} + +void e820_add(struct e820_ctx *ctx, enum e820_type type, u64 addr, u64 size) +{ + struct e820_entry *entry = &ctx->entries[ctx->count++]; + + if (ctx->count <= ctx->max_entries) { + entry->addr = addr; + entry->size = size; + entry->type = type; + } + ctx->addr = addr + size; +} + +void e820_next(struct e820_ctx *ctx, enum e820_type type, u64 size) +{ + e820_add(ctx, type, ctx->addr, size); +} + +void e820_to_addr(struct e820_ctx *ctx, enum e820_type type, u64 addr) +{ + e820_next(ctx, type, addr - ctx->addr); +} + +int e820_finish(struct e820_ctx *ctx) +{ + if (ctx->count > ctx->max_entries) { + printf("e820 has %d entries but room for only %d\n", ctx->count, + ctx->max_entries); + panic("e820 table too large"); + } + log_debug("e820 map installed, n=%d\n", ctx->count); + if (_DEBUG) + e820_dump(ctx->entries, ctx->count); + + return ctx->count; +} + #if CONFIG_IS_ENABLED(EFI_LOADER) void efi_add_known_memory(void) { |