mb/qemu-riscv: update to match current qemu version

Boots again to payload not found on qemu.

Change-Id: Ie107eb882cbaac5a5a06c1ff990e7b9364377640
Signed-off-by: Philipp Hug <philipp@hug.cx>
Reviewed-on: https://review.coreboot.org/c/30554
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

Documentation/mainboard/emulation/qemu-riscv.md

@@ -0,0 +1,8 @@
+# Qemu RISC-V emulator
+
+## Building coreboot and running it in Qemu
+
+- Configure coreboot and run `make` as usual
+- Run `util/riscv/make-spike-elf.sh build/coreboot.rom build/coreboot.elf` to
+  convert coreboot to an ELF that Qemu can load
+- Run `qemu-system-riscv64 -M virt -m 1024M -nographic -kernel build/coreboot.elf`

Documentation/mainboard/index.md

@@ -19,6 +19,7 @@ This section contains documentation about coreboot on specific mainboards.
 The boards in this section are not real mainboards, but emulators.
 
 - [Spike RISC-V emulator](emulation/spike-riscv.md)
+- [Qemu RISC-V emulator](emulation/qemu-riscv.md)
 
 ## Intel
 

src/mainboard/emulation/qemu-riscv/Kconfig

@@ -13,7 +13,8 @@
 ## GNU General Public License for more details.
 
 # To execute, do:
-# qemu-system-arm -M vexpress-a9 -m 1024M -nographic -kernel build/coreboot.rom
+# util/riscv/make-spike-elf.sh build/coreboot.rom build/coreboot.elf
+# qemu-system-riscv64 -M virt -m 1024M -nographic -kernel build/coreboot.elf
 
 if BOARD_EMULATION_QEMU_RISCV
 

src/mainboard/emulation/qemu-riscv/Makefile.inc

@@ -14,7 +14,7 @@
 
 bootblock-y += uart.c
 bootblock-y += rom_media.c
-bootblock-y += mtime.c
+bootblock-y += clint.c
 
 romstage-y += romstage.c
 romstage-y += uart.c
@@ -22,8 +22,10 @@ romstage-y += rom_media.c
 
 ramstage-y += uart.c
 ramstage-y += rom_media.c
-ramstage-y += mtime.c
+ramstage-y += clint.c
 
 bootblock-y += memlayout.ld
 romstage-y += memlayout.ld
 ramstage-y += memlayout.ld
+
+CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include

src/mainboard/emulation/qemu-riscv/clint.c

@@ -14,9 +14,12 @@
  */
 
 #include <mcall.h>
+#include <mainboard/addressmap.h>
 
-/* FIXME: This is an empty implementation, please improve */
 /* This function is used to initialize HLS()->time/HLS()->timecmp  */
 void mtime_init(void)
 {
+	long hart_id = read_csr(mhartid);
+	HLS()->time = (uint64_t *)(QEMU_VIRT_CLINT + 0xbff8);
+	HLS()->timecmp = (uint64_t *)(QEMU_VIRT_CLINT + 0x4000 + 8 * hart_id);
 }

src/mainboard/emulation/qemu-riscv/include/mainboard/addressmap.h

@@ -0,0 +1,20 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Philipp Hug
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#define QEMU_VIRT_CLINT		0x02000000
+#define QEMU_VIRT_PLIC		0x0c000000
+#define QEMU_VIRT_UART0		0x10000000
+#define QEMU_VIRT_VIRTIO	0x10001000
+#define QEMU_VIRT_DRAM		0x80000000

src/mainboard/emulation/qemu-riscv/mainboard.c

@@ -16,6 +16,7 @@
 #include <console/console.h>
 #include <device/device.h>
 #include <cbmem.h>
+#include <symbols.h>
 
 static void mainboard_enable(struct device *dev)
 {
@@ -24,7 +25,7 @@ static void mainboard_enable(struct device *dev)
 		die("No dev0; die\n");
 	}
 
-	ram_resource(dev, 0, 2048, 32768);
+	ram_resource(dev, 0, (uintptr_t)_dram / KiB, CONFIG_DRAM_SIZE_MB * KiB);
 	cbmem_recovery(0);
 }
 

src/mainboard/emulation/qemu-riscv/memlayout.ld

@@ -14,15 +14,16 @@
  */
 
 #include <memlayout.h>
-
 #include <arch/header.ld>
 
+#define START 0x80000000
+
 SECTIONS
 {
-	DRAM_START(0x0)
-	BOOTBLOCK(0x0, 64K)
-	ROMSTAGE(0x20000, 128K)
-	STACK(0x40000, 0x3ff00)
-	PRERAM_CBMEM_CONSOLE(0x80000, 8K)
-	RAMSTAGE(0x100000, 16M)
+	DRAM_START(START)
+	BOOTBLOCK(START, 64K)
+	STACK(START + 4M, 4K)
+	ROMSTAGE(START + 4M + 64K, 128K)
+	PRERAM_CBMEM_CONSOLE(START + 4M + 192K, 8K)
+	RAMSTAGE(START + 4M + 200K, 16M)
 }

src/mainboard/emulation/qemu-riscv/rom_media.c

@@ -14,11 +14,12 @@
  * GNU General Public License for more details.
  */
 #include <boot_device.h>
+#include <symbols.h>
 
-/* This assumes that the CBFS resides at 0x0, which is true for the default
- * configuration. */
+/* This assumes that the CBFS resides at start of dram, which is true for the
+ * default configuration. */
 static const struct mem_region_device boot_dev =
-	MEM_REGION_DEV_RO_INIT(NULL, CONFIG_ROM_SIZE);
+	MEM_REGION_DEV_RO_INIT(_dram, CONFIG_ROM_SIZE);
 
 const struct region_device *boot_device_ro(void)
 {

src/mainboard/emulation/qemu-riscv/uart.c

@@ -17,8 +17,9 @@
 #include <console/uart.h>
 #include <arch/io.h>
 #include <boot/coreboot_tables.h>
+#include <mainboard/addressmap.h>
 
-static uint8_t *buf = (void *)0x3f8;
+static uint8_t *buf = (void *)QEMU_VIRT_UART0;
 uintptr_t uart_platform_base(int idx)
 {
 	return (uintptr_t) buf;
@@ -47,7 +48,7 @@ void uart_fill_lb(void *data)
 {
 	struct lb_serial serial;
 	serial.type = LB_SERIAL_TYPE_MEMORY_MAPPED;
-	serial.baseaddr = 0x3f8;
+	serial.baseaddr = QEMU_VIRT_UART0;
 	serial.baud = 115200;
 	serial.regwidth = 1;
 	lb_add_serial(&serial, data);