From: wangyao@lemote.com
To: ardb@kernel.org, chenhuacai@kernel.org, wangrui@loongson.cn
Cc: linux-efi@vger.kernel.org, ainux.wang@gmail.com,
Wang Yao <wangyao@lemote.com>
Subject: [PATCH] efi/loongarch: Change MMU translation mode
Date: Wed, 22 Nov 2023 16:49:06 +0800 [thread overview]
Message-ID: <20231122084906.12476-1-wangyao@lemote.com> (raw)
From: Wang Yao <wangyao@lemote.com>
Refer ot UEFI spec v2.10 section 2.3.8 LoongArch Platforms:
The processor is in the following execution mode during boot service:
...
The memory is in physical addressing mode. LoongArch architecture
defines two memory access mode, namely direct address translation
mode and mapped address translation mode.
So need to change MMU translation mode before config direct mapping.
Signed-off-by: Wang Yao <wangyao@lemote.com>
---
drivers/firmware/efi/libstub/loongarch.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/efi/libstub/loongarch.c b/drivers/firmware/efi/libstub/loongarch.c
index 807cba2693fc..4c0a84c58f5b 100644
--- a/drivers/firmware/efi/libstub/loongarch.c
+++ b/drivers/firmware/efi/libstub/loongarch.c
@@ -49,7 +49,7 @@ efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
struct exit_boot_struct priv;
unsigned long desc_size;
efi_status_t status;
- u32 desc_ver;
+ u32 desc_ver, val;
status = efi_alloc_virtmap(&priv.runtime_map, &desc_size, &desc_ver);
if (status != EFI_SUCCESS) {
@@ -69,6 +69,12 @@ efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
priv.runtime_entry_count * desc_size, desc_size,
desc_ver, priv.runtime_map);
+ /* Change address translation mode */
+ val = csr_read32(LOONGARCH_CSR_CRMD);
+ val &= ~CSR_CRMD_DA;
+ val |= CSR_CRMD_PG;
+ csr_write32(val, LOONGARCH_CSR_CRMD);
+
/* Config Direct Mapping */
csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0);
csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1);
--
2.27.0
next reply other threads:[~2023-11-22 8:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-22 8:49 wangyao [this message]
2023-11-22 14:22 ` [PATCH] efi/loongarch: Change MMU translation mode Huacai Chen
2023-11-23 0:22 ` Ainux Wang
2023-11-23 4:05 ` Huacai Chen
2023-11-23 7:05 ` Ainux Wang
2023-11-23 7:49 ` Huacai Chen
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