From mboxrd@z Thu Jan 1 00:00:00 1970 From: Leif Lindholm Subject: [PATCH v2 08/15] efi: Add get_dram_base() helper function Date: Thu, 13 Mar 2014 22:47:01 +0000 Message-ID: <1394750828-16351-9-git-send-email-leif.lindholm@linaro.org> References: <1394750828-16351-1-git-send-email-leif.lindholm@linaro.org> Return-path: In-Reply-To: <1394750828-16351-1-git-send-email-leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, catalin.marinas-5wv7dgnIgG8@public.gmane.org, matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org Cc: msalter-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, roy.franz-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, Leif Lindholm List-Id: linux-efi@vger.kernel.org From: Roy Franz Add the get_dram_base() function, shared by arm/arm64. Signed-off-by: Roy Franz Signed-off-by: Leif Lindholm --- drivers/firmware/efi/efi-stub-helper.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c index 4c8ab86..4a9986b 100644 --- a/drivers/firmware/efi/efi-stub-helper.c +++ b/drivers/firmware/efi/efi-stub-helper.c @@ -11,6 +11,10 @@ */ #define EFI_READ_CHUNK_SIZE (1024 * 1024) +/* error code which can't be mistaken for valid address */ +#define EFI_ERROR (~0UL) + + struct file_info { efi_file_handle_t *handle; u64 size; @@ -92,6 +96,32 @@ fail: return status; } + +static unsigned long __init get_dram_base(efi_system_table_t *sys_table) +{ + efi_status_t status; + unsigned long map_size; + unsigned long membase = EFI_ERROR; + struct efi_memory_map map; + efi_memory_desc_t *md; + + status = efi_get_memory_map(sys_table, (efi_memory_desc_t **)&map.map, + &map_size, &map.desc_size, NULL, NULL); + if (status != EFI_SUCCESS) + return membase; + + map.map_end = map.map + map_size; + + for_each_efi_memory_desc(&map, md) + if (md->attribute & EFI_MEMORY_WB) + if (membase > md->phys_addr) + membase = md->phys_addr; + + efi_call_phys1(sys_table->boottime->free_pool, map.map); + + return membase; +} + /* * Allocate at the highest possible address that is not above 'max'. */ -- 1.7.10.4