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| author | Thomas Heijligen <thomas.heijligen@secunet.com> | 2019-01-10 18:19:06 +0100 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2019-02-05 10:56:22 +0000 |
| commit | da9aa6ddd78dc61bfc34dd85996f45b2f07e22c6 (patch) | |
| tree | ba4dfe1af55312f65895a69bff7d65f3fdddce16 /src/mainboard/emulation/qemu-i440fx | |
| parent | 721c8b457bb6eb43f4e7c35a0eaa8b70ad92922f (diff) | |
| download | coreboot-da9aa6ddd78dc61bfc34dd85996f45b2f07e22c6.tar.xz | |
mb/emulation/qemu-i440fx: add e820 interface
Qemu provides e820 table at fw_cfg interface. Add functions to access it.
Change-Id: I547bc7fef09999baa28149a6325cbca91e31e99b
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Reviewed-on: https://review.coreboot.org/c/30848
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Diffstat (limited to 'src/mainboard/emulation/qemu-i440fx')
| -rw-r--r-- | src/mainboard/emulation/qemu-i440fx/fw_cfg.c | 39 | ||||
| -rw-r--r-- | src/mainboard/emulation/qemu-i440fx/fw_cfg.h | 1 |
2 files changed, 40 insertions, 0 deletions
diff --git a/src/mainboard/emulation/qemu-i440fx/fw_cfg.c b/src/mainboard/emulation/qemu-i440fx/fw_cfg.c index b859bdbcb7..c5d5a47008 100644 --- a/src/mainboard/emulation/qemu-i440fx/fw_cfg.c +++ b/src/mainboard/emulation/qemu-i440fx/fw_cfg.c @@ -83,6 +83,45 @@ int fw_cfg_check_file(FWCfgFile *file, const char *name) return fw_cfg_find_file(file, name); } +static int fw_cfg_e820_select(uint32_t *size) +{ + FWCfgFile file; + + if (!fw_cfg_present() || fw_cfg_find_file(&file, "etc/e820")) + return -1; + fw_cfg_select(file.select); + *size = file.size; + return 0; +} + +static int fw_cfg_e820_read(FwCfgE820Entry *entry, uint32_t *size, + uint32_t *pos) +{ + if (*pos + sizeof(*entry) > *size) + return -1; + + fw_cfg_read(entry, sizeof(*entry)); + *pos += sizeof(*entry); + return 0; +} + +/* returns tolud on success or 0 on failure */ +uintptr_t fw_cfg_tolud(void) +{ + FwCfgE820Entry e; + uint64_t top = 0; + uint32_t size = 0, pos = 0; + + if (fw_cfg_e820_select(&size)) { + while (!fw_cfg_e820_read(&e, &size, &pos)) { + uint64_t limit = e.address + e.length; + if (e.type == 1 && limit < 4ULL * GiB && limit > top) + top = limit; + } + } + return (uintptr_t)top; +} + int fw_cfg_max_cpus(void) { unsigned short max_cpus; diff --git a/src/mainboard/emulation/qemu-i440fx/fw_cfg.h b/src/mainboard/emulation/qemu-i440fx/fw_cfg.h index 91b758c46d..975801b60e 100644 --- a/src/mainboard/emulation/qemu-i440fx/fw_cfg.h +++ b/src/mainboard/emulation/qemu-i440fx/fw_cfg.h @@ -18,5 +18,6 @@ void fw_cfg_get(uint16_t entry, void *dst, int dstlen); int fw_cfg_check_file(FWCfgFile *file, const char *name); int fw_cfg_max_cpus(void); unsigned long fw_cfg_smbios_tables(int *handle, unsigned long *current); +uintptr_t fw_cfg_tolud(void); #endif /* FW_CFG_H */ |