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81f5d15c48
32BIT platforms only have 32bit CSR/IOCSR registers, 64BIT platforms have both 32bit/64bit CSR/IOCSR registers. Now there are both 32bit and 64bit CSR accessors: csr_read32()/csr_write32()/csr_xchg32(); csr_read64()/csr_write64()/csr_xchg64(); Some CSR registers (address and timer registers) are 32bit length on 32BIT platform and 64bit length on 64BIT platform. To avoid #ifdefs here and there, they need adaptive accessors, so we define and use: csr_read()/csr_write()/csr_xchg(); IOCSR doesn't have a "natural length", which means a 64bit register can be treated as two 32bit registers, so we just use two 32bit accessors to emulate a 64bit accessors. Reviewed-by: Arnd Bergmann <arnd@arndb.de> 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_write(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0);
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csr_write(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1);
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csr_write(CSR_DMW2_INIT, LOONGARCH_CSR_DMWIN2);
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csr_write(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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