[PATCH v7 07/17] hw/loongarch: Init efi_initrd table

[Song Gao <gaosong@loongson.cn>]

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Message-Id: <20240307164835.300412-8-gaosong@loongson.cn>
---
 include/hw/loongarch/boot.h |  9 +++++++++
 hw/loongarch/boot.c         | 23 +++++++++++++++++++++--
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/include/hw/loongarch/boot.h b/include/hw/loongarch/boot.h
index 76622af2e2..42d1ee3663 100644
--- a/include/hw/loongarch/boot.h
+++ b/include/hw/loongarch/boot.h
@@ -30,6 +30,10 @@ typedef struct {
         EFI_GUID(0x800f683f, 0xd08b, 0x423a,  0xa2, 0x93, \
                  0x96, 0x5c, 0x3c, 0x6f, 0xe2, 0xb4)
 
+#define LINUX_EFI_INITRD_MEDIA_GUID \
+        EFI_GUID(0x5568e427, 0x68fc, 0x4f3d,  0xac, 0x74, \
+                 0xca, 0x55, 0x52, 0x31, 0xcc, 0x68)
+
 struct efi_config_table {
     efi_guid_t guid;
     uint64_t *ptr;
@@ -83,6 +87,11 @@ struct efi_boot_memmap {
     efi_memory_desc_t map[32];
 };
 
+struct efi_initrd {
+    uint64_t base;
+    uint64_t size;
+};
+
 struct loongarch_boot_info {
     uint64_t ram_size;
     const char *kernel_filename;
diff --git a/hw/loongarch/boot.c b/hw/loongarch/boot.c
index 18aae3434d..1f6cb8ddd7 100644
--- a/hw/loongarch/boot.c
+++ b/hw/loongarch/boot.c
@@ -15,6 +15,9 @@
 #include "sysemu/reset.h"
 #include "sysemu/qtest.h"
 
+ram_addr_t initrd_offset;
+uint64_t initrd_size;
+
 static const unsigned int slave_boot_code[] = {
                   /* Configure reset ebase.                    */
     0x0400302c,   /* csrwr      $t0, LOONGARCH_CSR_EENTRY      */
@@ -95,6 +98,21 @@ static void init_efi_boot_memmap(struct efi_system_table *systab,
     }
 }
 
+static void init_efi_initrd_table(struct efi_system_table *systab,
+                                  void *p, void *start)
+{
+    efi_guid_t tbl_guid = LINUX_EFI_INITRD_MEDIA_GUID;
+    struct efi_initrd *initrd_table  = p;
+
+    /* efi_configuration_table 2 */
+    guidcpy(&systab->tables[1].guid, &tbl_guid);
+    systab->tables[1].table = (struct efi_configuration_table *)(p - start);
+    systab->nr_tables = 2;
+
+    initrd_table->base = initrd_offset;
+    initrd_table->size = initrd_size;
+}
+
 static void init_systab(struct loongarch_boot_info *info, void *p, void *start)
 {
     void *bp_tables_start;
@@ -118,6 +136,8 @@ static void init_systab(struct loongarch_boot_info *info, void *p, void *start)
     init_efi_boot_memmap(systab, p, start);
     p += ROUND_UP(sizeof(struct efi_boot_memmap) +
                   sizeof(efi_memory_desc_t) * memmap_entries, 64 * KiB);
+    init_efi_initrd_table(systab, p, start);
+    p += ROUND_UP(sizeof(struct efi_initrd), 64 * KiB);
 
     systab->tables = (struct efi_configuration_table *)(bp_tables_start - start);
 }
@@ -139,8 +159,7 @@ static uint64_t cpu_loongarch_virt_to_phys(void *opaque, uint64_t addr)
 
 static int64_t load_kernel_info(struct loongarch_boot_info *info)
 {
-    uint64_t kernel_entry, kernel_low, kernel_high, initrd_size;
-    ram_addr_t initrd_offset;
+    uint64_t kernel_entry, kernel_low, kernel_high;
     ssize_t kernel_size;
 
     kernel_size = load_elf(info->kernel_filename, NULL,
-- 
2.25.1