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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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628c3bb40e
Add basic boot, setup and reset routines for LoongArch. Now, LoongArch machines use UEFI-based firmware. The firmware passes configuration information to the kernel via ACPI and DMI/SMBIOS. Currently an existing interface between the kernel and the bootloader is implemented. Kernel gets 2 values from the bootloader, passed in registers a0 and a1; a0 is an "EFI boot flag" distinguishing UEFI and non-UEFI firmware, while a1 is a pointer to an FDT with systable, memmap, cmdline and initrd information. The standard UEFI boot protocol (EFISTUB) will be added later. Cc: linux-efi@vger.kernel.org Cc: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Co-developed-by: Yun Liu <liuyun@loongson.cn> Signed-off-by: Yun Liu <liuyun@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Author: Huacai Chen <chenhuacai@loongson.cn>
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*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#include <linux/acpi.h>
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#include <linux/efi.h>
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#include <linux/export.h>
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#include <linux/memblock.h>
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#include <linux/of_fdt.h>
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#include <asm/early_ioremap.h>
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#include <asm/bootinfo.h>
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#include <asm/loongson.h>
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u64 efi_system_table;
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struct loongson_system_configuration loongson_sysconf;
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EXPORT_SYMBOL(loongson_sysconf);
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u64 loongson_chipcfg[MAX_PACKAGES];
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u64 loongson_chiptemp[MAX_PACKAGES];
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u64 loongson_freqctrl[MAX_PACKAGES];
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unsigned long long smp_group[MAX_PACKAGES];
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static void __init register_addrs_set(u64 *registers, const u64 addr, int num)
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{
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u64 i;
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for (i = 0; i < num; i++) {
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*registers = (i << 44) | addr;
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registers++;
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}
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}
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void __init init_environ(void)
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{
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int efi_boot = fw_arg0;
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struct efi_memory_map_data data;
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void *fdt_ptr = early_memremap_ro(fw_arg1, SZ_64K);
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if (efi_boot)
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set_bit(EFI_BOOT, &efi.flags);
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else
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clear_bit(EFI_BOOT, &efi.flags);
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early_init_dt_scan(fdt_ptr);
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early_init_fdt_reserve_self();
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efi_system_table = efi_get_fdt_params(&data);
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efi_memmap_init_early(&data);
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memblock_reserve(data.phys_map & PAGE_MASK,
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PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK)));
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register_addrs_set(smp_group, TO_UNCACHE(0x1fe01000), 16);
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register_addrs_set(loongson_chipcfg, TO_UNCACHE(0x1fe00180), 16);
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register_addrs_set(loongson_chiptemp, TO_UNCACHE(0x1fe0019c), 16);
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register_addrs_set(loongson_freqctrl, TO_UNCACHE(0x1fe001d0), 16);
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}
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static int __init init_cpu_fullname(void)
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{
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int cpu;
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if (loongson_sysconf.cpuname && !strncmp(loongson_sysconf.cpuname, "Loongson", 8)) {
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for (cpu = 0; cpu < NR_CPUS; cpu++)
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__cpu_full_name[cpu] = loongson_sysconf.cpuname;
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}
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return 0;
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}
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arch_initcall(init_cpu_fullname);
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static ssize_t boardinfo_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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return sprintf(buf,
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"BIOS Information\n"
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"Vendor\t\t\t: %s\n"
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"Version\t\t\t: %s\n"
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"ROM Size\t\t: %d KB\n"
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"Release Date\t\t: %s\n\n"
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"Board Information\n"
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"Manufacturer\t\t: %s\n"
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"Board Name\t\t: %s\n"
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"Family\t\t\t: LOONGSON64\n\n",
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b_info.bios_vendor, b_info.bios_version,
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b_info.bios_size, b_info.bios_release_date,
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b_info.board_vendor, b_info.board_name);
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}
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static struct kobj_attribute boardinfo_attr = __ATTR(boardinfo, 0444,
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boardinfo_show, NULL);
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static int __init boardinfo_init(void)
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{
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struct kobject *loongson_kobj;
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loongson_kobj = kobject_create_and_add("loongson", firmware_kobj);
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return sysfs_create_file(loongson_kobj, &boardinfo_attr.attr);
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}
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late_initcall(boardinfo_init);
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