LoongArch: Support loader and kernel interface V40

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP

--------------------------------

1. LoongArch uses the new interface parameter form:
a0: efi flag, a1: command line, a2: system table
2. Boot memmap and initrd are passed to kernel via GUID.
Signed-off-by: NQiming Yang <yangqiming@loongson.cn>
Signed-off-by: NJianmin Lv <lvjianmin@loongson.cn>
Change-Id: I193db4238e28962bdc4ae82a232d0c343f4f32f3
(cherry picked from commit a51ad547)

arch/loongarch/include/asm/efi.h

@@ -18,6 +18,23 @@ void __init efi_runtime_init(void);
 #define EFI_ALLOC_ALIGN		SZ_64K
 #define EFI_RT_VIRTUAL_OFFSET	CSR_DMW0_BASE
 
+#define LINUX_EFI_INITRD_MEDIA_GUID		EFI_GUID(0x5568e427, 0x68fc, 0x4f3d,  0xac, 0x74, 0xca, 0x55, 0x52, 0x31, 0xcc, 0x68)
+#define LINUX_EFI_NEW_MEMMAP_GUID		EFI_GUID(0x800f683f, 0xd08b, 0x423a,  0xa2, 0x93, 0x96, 0x5c, 0x3c, 0x6f, 0xe2, 0xb4)
+
+struct linux_efi_initrd {
+	unsigned long	base;
+	unsigned long	size;
+};
+
+struct efi_new_memmap {
+	unsigned long		map_size;
+	unsigned long		desc_size;
+	u32			desc_ver;
+	unsigned long		map_key;
+	unsigned long		buff_size;
+	efi_memory_desc_t	map[];
+};
+
 static inline struct screen_info *alloc_screen_info(void)
 {
 	return &screen_info;

arch/loongarch/kernel/efi.c

@@ -20,6 +20,7 @@
 #include <linux/memblock.h>
 #include <linux/reboot.h>
 #include <linux/uaccess.h>
+#include <linux/initrd.h>
 
 #include <asm/early_ioremap.h>
 #include <asm/efi.h>
@@ -27,11 +28,18 @@
 #include <asm/loongson.h>
 #include "legacy_boot.h"
 
+static __initdata unsigned long new_memmap = EFI_INVALID_TABLE_ADDR;
+static __initdata unsigned long initrd = EFI_INVALID_TABLE_ADDR;
+
 static unsigned long efi_nr_tables;
 static unsigned long efi_config_table;
 
 static efi_system_table_t *efi_systab;
-static efi_config_table_type_t arch_tables[] __initdata = {{},};
+static efi_config_table_type_t arch_tables[] __initdata = {
+	{LINUX_EFI_NEW_MEMMAP_GUID, &new_memmap, "NEWMEM"},
+	{LINUX_EFI_INITRD_MEDIA_GUID, &initrd, "INITRD"},
+	{},
+};
 static __initdata pgd_t *pgd_efi;
 
 static int __init efimap_populate_hugepages(
@@ -184,6 +192,9 @@ static int __init set_virtual_map(void)
 			(efi_memory_desc_t *)TO_PHYS((unsigned long)runtime_map));
 
 	efi_unmap_pgt();
+	if (status != EFI_SUCCESS)
+		return -1;
+
 	return 0;
 }
 
@@ -213,6 +224,44 @@ void __init efi_runtime_init(void)
 	set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
 }
 
+static void __init get_initrd(void)
+{
+	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) &&
+		initrd != EFI_INVALID_TABLE_ADDR && phys_initrd_size == 0) {
+		struct linux_efi_initrd *tbl;
+
+		tbl = early_memremap(initrd, sizeof(*tbl));
+		if (tbl) {
+			phys_initrd_start = tbl->base;
+			phys_initrd_size = tbl->size;
+			early_memunmap(tbl, sizeof(*tbl));
+		}
+	}
+}
+
+static void __init init_new_memmap(void)
+{
+	struct efi_new_memmap *tbl;
+
+	if (new_memmap == EFI_INVALID_TABLE_ADDR)
+		return;
+
+	tbl = early_memremap_ro(new_memmap, sizeof(*tbl));
+	if (tbl) {
+		struct efi_memory_map_data data;
+
+		data.phys_map           = new_memmap + sizeof(*tbl);
+		data.size               = tbl->map_size;
+		data.desc_size          = tbl->desc_size;
+		data.desc_version       = tbl->desc_ver;
+
+		if (efi_memmap_init_early(&data) < 0)
+			panic("Unable to map EFI memory map.\n");
+
+		early_memunmap(tbl, sizeof(*tbl));
+	}
+}
+
 void __init loongson_efi_init(void)
 {
 	int size;
@@ -237,6 +286,10 @@ void __init loongson_efi_init(void)
 	efi_config_parse_tables(config_tables, efi_systab->nr_tables, arch_tables);
 	early_memunmap(config_tables, efi_nr_tables * size);
 
+	get_initrd();
+
+	init_new_memmap();
+
 	if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI)
 		memblock_reserve(screen_info.lfb_base, screen_info.lfb_size);
 }

arch/loongarch/kernel/env.c

@@ -22,7 +22,8 @@ void __init init_environ(void)
 {
 	int efi_boot = fw_arg0;
 	struct efi_memory_map_data data;
-	void *fdt_ptr = early_memremap_ro(fw_arg1, SZ_64K);
+	char *cmdline;
+	void *fdt_ptr;
 
 	if (efi_bp)
 		return;
@@ -32,6 +33,20 @@ void __init init_environ(void)
 	else
 		clear_bit(EFI_BOOT, &efi.flags);
 
+	if (fw_arg2 == 0)
+		goto parse_fdt;
+
+	cmdline = early_memremap_ro(fw_arg1, COMMAND_LINE_SIZE);
+	strscpy(boot_command_line, cmdline, COMMAND_LINE_SIZE);
+	early_memunmap(cmdline, COMMAND_LINE_SIZE);
+
+	efi_system_table = fw_arg2;
+
+	return;
+
+parse_fdt:
+	fdt_ptr = early_memremap_ro(fw_arg1, SZ_64K);
+
 	early_init_dt_scan(fdt_ptr);
 	early_init_fdt_reserve_self();
 	efi_system_table = efi_get_fdt_params(&data);

arch/loongarch/kernel/legacy_boot.c

@@ -525,7 +525,7 @@ unsigned long legacy_boot_init(unsigned long argc, unsigned long cmdptr, unsigne
 {
 	int ret;
 
-	if (!bpi)
+	if (!bpi || (argc < 2))
 		return -1;
 	efi_bp = (struct boot_params *)bpi;
 	bpi_version = get_bpi_version(&efi_bp->signature);

arch/loongarch/kernel/setup.c

@@ -216,7 +216,6 @@ static void __init set_pcie_wakeup(void)
 
 void __init platform_init(void)
 {
-	loongson_efi_init();
 #ifdef CONFIG_ACPI_TABLE_UPGRADE
 	acpi_table_upgrade();
 #endif
@@ -378,6 +377,7 @@ void __init setup_arch(char **cmdline_p)
 	legacy_boot_init(fw_arg0, fw_arg1, fw_arg2);
 
 	init_environ();
+	loongson_efi_init();
 	memblock_init();
 	pagetable_init();
 	parse_early_param();