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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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8e02c3b782
Currently, only TLB-based ioremap() support writecombine, so add the counterpart for DMW-based ioremap() with help of DMW2. The base address (WRITECOMBINE_BASE) is configured as 0xa000000000000000. DMW3 is unused by kernel now, however firmware may leave garbage in them and interfere kernel's address mapping. So clear it as necessary. BTW, centralize the DMW configuration to macro SETUP_DMWINS. Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Author: Yun Liu <liuyun@loongson.cn>
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* Huacai Chen <chenhuacai@loongson.cn>
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <asm/efi.h>
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#include <asm/addrspace.h>
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#include "efistub.h"
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#include "loongarch-stub.h"
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typedef void __noreturn (*kernel_entry_t)(bool efi, unsigned long cmdline,
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unsigned long systab);
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efi_status_t check_platform_features(void)
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{
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return EFI_SUCCESS;
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}
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struct exit_boot_struct {
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efi_memory_desc_t *runtime_map;
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int runtime_entry_count;
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};
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static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
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{
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struct exit_boot_struct *p = priv;
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/*
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* Update the memory map with virtual addresses. The function will also
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* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
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* entries so that we can pass it straight to SetVirtualAddressMap()
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*/
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efi_get_virtmap(map->map, map->map_size, map->desc_size,
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p->runtime_map, &p->runtime_entry_count);
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return EFI_SUCCESS;
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}
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unsigned long __weak kernel_entry_address(unsigned long kernel_addr,
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efi_loaded_image_t *image)
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{
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return *(unsigned long *)(kernel_addr + 8) - PHYSADDR(VMLINUX_LOAD_ADDRESS) + kernel_addr;
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}
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efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
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unsigned long kernel_addr, char *cmdline_ptr)
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{
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kernel_entry_t real_kernel_entry;
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struct exit_boot_struct priv;
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unsigned long desc_size;
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efi_status_t status;
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u32 desc_ver;
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status = efi_alloc_virtmap(&priv.runtime_map, &desc_size, &desc_ver);
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if (status != EFI_SUCCESS) {
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efi_err("Unable to retrieve UEFI memory map.\n");
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return status;
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}
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efi_info("Exiting boot services\n");
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efi_novamap = false;
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status = efi_exit_boot_services(handle, &priv, exit_boot_func);
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if (status != EFI_SUCCESS)
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return status;
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/* Install the new virtual address map */
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efi_rt_call(set_virtual_address_map,
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priv.runtime_entry_count * desc_size, desc_size,
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desc_ver, priv.runtime_map);
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/* Config Direct Mapping */
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csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0);
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csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1);
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csr_write64(CSR_DMW2_INIT, LOONGARCH_CSR_DMWIN2);
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csr_write64(CSR_DMW3_INIT, LOONGARCH_CSR_DMWIN3);
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real_kernel_entry = (void *)kernel_entry_address(kernel_addr, image);
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real_kernel_entry(true, (unsigned long)cmdline_ptr,
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(unsigned long)efi_system_table);
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}
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