x86: Implement functions for writing coreboot table

To prepare generating coreboot table from U-Boot, implement functions
to handle the writing.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/x86/include/asm/coreboot_tables.h

@@ -294,4 +294,14 @@ struct cbmem_entry {
 #define CBMEM_ID_CONSOLE		0x434f4e53
 #define CBMEM_ID_NONE			0x00000000
 
+/**
+ * write_coreboot_table() - write coreboot table
+ *
+ * This writes coreboot table at a given address.
+ *
+ * @addr:	start address to write coreboot table
+ * @cfg_tables:	pointer to configuration table memory area
+ */
+void write_coreboot_table(u32 addr, struct memory_area *cfg_tables);
+
 #endif

arch/x86/lib/Makefile

@@ -10,6 +10,7 @@ obj-y += bios_asm.o
 obj-y += bios_interrupts.o
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 obj-y	+= cmd_boot.o
+obj-y	+= coreboot_table.o
 obj-$(CONFIG_EFI) += efi/
 obj-y	+= e820.o
 obj-y	+= gcc.o

arch/x86/lib/coreboot_table.c

@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2016, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <vbe.h>
+#include <asm/coreboot_tables.h>
+#include <asm/e820.h>
+
+/**
+ * cb_table_init() - initialize a coreboot table header
+ *
+ * This fills in the coreboot table header signature and the header bytes.
+ * Other fields are set to zero.
+ *
+ * @cbh:	coreboot table header address
+ */
+static void cb_table_init(struct cb_header *cbh)
+{
+	memset(cbh, 0, sizeof(struct cb_header));
+	memcpy(cbh->signature, "LBIO", 4);
+	cbh->header_bytes = sizeof(struct cb_header);
+}
+
+/**
+ * cb_table_add_entry() - add a coreboot table entry
+ *
+ * This increases the coreboot table entry size with added table entry length
+ * and increases entry count by 1.
+ *
+ * @cbh:	coreboot table header address
+ * @cbr:	to be added table entry address
+ * @return:	pointer to next table entry address
+ */
+static u32 cb_table_add_entry(struct cb_header *cbh, struct cb_record *cbr)
+{
+	cbh->table_bytes += cbr->size;
+	cbh->table_entries++;
+
+	return (u32)cbr + cbr->size;
+}
+
+/**
+ * cb_table_finalize() - finalize the coreboot table
+ *
+ * This calculates the checksum for all coreboot table entries as well as
+ * the checksum for the coreboot header itself.
+ *
+ * @cbh:	coreboot table header address
+ */
+static void cb_table_finalize(struct cb_header *cbh)
+{
+	struct cb_record *cbr = (struct cb_record *)(cbh + 1);
+
+	cbh->table_checksum = compute_ip_checksum(cbr, cbh->table_bytes);
+	cbh->header_checksum = compute_ip_checksum(cbh, cbh->header_bytes);
+}
+
+void write_coreboot_table(u32 addr, struct memory_area *cfg_tables)
+{
+	struct cb_header *cbh = (struct cb_header *)addr;
+	struct cb_record *cbr;
+	struct cb_memory *mem;
+	struct cb_memory_range *map;
+	struct e820entry e820[32];
+	struct cb_framebuffer *fb;
+	struct vesa_mode_info *vesa;
+	int i, num;
+
+	cb_table_init(cbh);
+	cbr = (struct cb_record *)(cbh + 1);
+
+	/*
+	 * Two type of coreboot table entries are generated by us.
+	 * They are 'struct cb_memory' and 'struct cb_framebuffer'.
+	 */
+
+	/* populate memory map table */
+	mem = (struct cb_memory *)cbr;
+	mem->tag = CB_TAG_MEMORY;
+	map = mem->map;
+
+	/* first install e820 defined memory maps */
+	num = install_e820_map(ARRAY_SIZE(e820), e820);
+	for (i = 0; i < num; i++) {
+		map->start.lo = e820[i].addr & 0xffffffff;
+		map->start.hi = e820[i].addr >> 32;
+		map->size.lo = e820[i].size & 0xffffffff;
+		map->size.hi = e820[i].size >> 32;
+		map->type = e820[i].type;
+		map++;
+	}
+
+	/* then install all configuration tables */
+	while (cfg_tables->size) {
+		map->start.lo = cfg_tables->start & 0xffffffff;
+		map->start.hi = cfg_tables->start >> 32;
+		map->size.lo = cfg_tables->size & 0xffffffff;
+		map->size.hi = cfg_tables->size >> 32;
+		map->type = CB_MEM_TABLE;
+		map++;
+		num++;
+		cfg_tables++;
+	}
+	mem->size = num * sizeof(struct cb_memory_range) +
+		    sizeof(struct cb_record);
+	cbr = (struct cb_record *)cb_table_add_entry(cbh, cbr);
+
+	/* populate framebuffer table if we have sane vesa info */
+	vesa = &mode_info.vesa;
+	if (vesa->x_resolution && vesa->y_resolution) {
+		fb = (struct cb_framebuffer *)cbr;
+		fb->tag = CB_TAG_FRAMEBUFFER;
+		fb->size = sizeof(struct cb_framebuffer);
+
+		fb->x_resolution = vesa->x_resolution;
+		fb->y_resolution = vesa->y_resolution;
+		fb->bits_per_pixel = vesa->bits_per_pixel;
+		fb->bytes_per_line = vesa->bytes_per_scanline;
+		fb->physical_address = vesa->phys_base_ptr;
+		fb->red_mask_size = vesa->red_mask_size;
+		fb->red_mask_pos = vesa->red_mask_pos;
+		fb->green_mask_size = vesa->green_mask_size;
+		fb->green_mask_pos = vesa->green_mask_pos;
+		fb->blue_mask_size = vesa->blue_mask_size;
+		fb->blue_mask_pos = vesa->blue_mask_pos;
+		fb->reserved_mask_size = vesa->reserved_mask_size;
+		fb->reserved_mask_pos = vesa->reserved_mask_pos;
+
+		cbr = (struct cb_record *)cb_table_add_entry(cbh, cbr);
+	}
+
+	cb_table_finalize(cbh);
+}