x86: Support QEMU x86 targets
This commit introduces the initial U-Boot support for QEMU x86 targets.
U-Boot can boot from coreboot as a payload, or directly without coreboot.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Merged in patch 'x86: qemu: Add CMD_NET to qemu-x86_defconfig
https://patchwork.ozlabs.org/patch/479745/
diff --git a/arch/x86/cpu/qemu/Kconfig b/arch/x86/cpu/qemu/Kconfig
new file mode 100644
index 0000000..fb775d7
--- /dev/null
+++ b/arch/x86/cpu/qemu/Kconfig
@@ -0,0 +1,21 @@
+#
+# Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+config QEMU
+ bool
+ select TSC_CALIBRATION_BYPASS
+
+if QEMU
+
+config SYS_CAR_ADDR
+ hex
+ default 0xd0000
+
+config SYS_CAR_SIZE
+ hex
+ default 0x10000
+
+endif
diff --git a/arch/x86/cpu/qemu/Makefile b/arch/x86/cpu/qemu/Makefile
new file mode 100644
index 0000000..be79723
--- /dev/null
+++ b/arch/x86/cpu/qemu/Makefile
@@ -0,0 +1,8 @@
+#
+# Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-y += car.o dram.o qemu.o
+obj-$(CONFIG_PCI) += pci.o
diff --git a/arch/x86/cpu/qemu/car.S b/arch/x86/cpu/qemu/car.S
new file mode 100644
index 0000000..13b3aea
--- /dev/null
+++ b/arch/x86/cpu/qemu/car.S
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <asm/post.h>
+
+.globl car_init
+car_init:
+ /* Save the BIST result */
+ movl %eax, %ebp
+
+ post_code(POST_CAR_START)
+
+ /*
+ * Since we know we are running inside emulator,
+ * we can do nothing here for CAR initialization.
+ */
+
+ /* Restore the BIST result */
+ movl %ebp, %eax
+
+ post_code(POST_CAR_CPU_CACHE)
+ jmp car_init_ret
diff --git a/arch/x86/cpu/qemu/dram.c b/arch/x86/cpu/qemu/dram.c
new file mode 100644
index 0000000..a88d0d2
--- /dev/null
+++ b/arch/x86/cpu/qemu/dram.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/post.h>
+#include <asm/arch/qemu.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+ u32 ram;
+
+ outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT);
+ ram = ((u32)inb(CMOS_DATA_PORT)) << 14;
+ outb(LOW_RAM_ADDR, CMOS_ADDR_PORT);
+ ram |= ((u32)inb(CMOS_DATA_PORT)) << 6;
+ ram += 16 * 1024;
+
+ gd->ram_size = ram * 1024;
+ post_code(POST_DRAM);
+
+ return 0;
+}
+
+void dram_init_banksize(void)
+{
+ gd->bd->bi_dram[0].start = 0;
+ gd->bd->bi_dram[0].size = gd->ram_size;
+}
+
+/*
+ * This function looks for the highest region of memory lower than 4GB which
+ * has enough space for U-Boot where U-Boot is aligned on a page boundary.
+ * It overrides the default implementation found elsewhere which simply
+ * picks the end of ram, wherever that may be. The location of the stack,
+ * the relocation address, and how far U-Boot is moved by relocation are
+ * set in the global data structure.
+ */
+ulong board_get_usable_ram_top(ulong total_size)
+{
+ return gd->ram_size;
+}
diff --git a/arch/x86/cpu/qemu/pci.c b/arch/x86/cpu/qemu/pci.c
new file mode 100644
index 0000000..d50ab75
--- /dev/null
+++ b/arch/x86/cpu/qemu/pci.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <pci.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void board_pci_setup_hose(struct pci_controller *hose)
+{
+ hose->first_busno = 0;
+ hose->last_busno = 0;
+
+ /* PCI memory space */
+ pci_set_region(hose->regions + 0,
+ CONFIG_PCI_MEM_BUS,
+ CONFIG_PCI_MEM_PHYS,
+ CONFIG_PCI_MEM_SIZE,
+ PCI_REGION_MEM);
+
+ /* PCI IO space */
+ pci_set_region(hose->regions + 1,
+ CONFIG_PCI_IO_BUS,
+ CONFIG_PCI_IO_PHYS,
+ CONFIG_PCI_IO_SIZE,
+ PCI_REGION_IO);
+
+ pci_set_region(hose->regions + 2,
+ CONFIG_PCI_PREF_BUS,
+ CONFIG_PCI_PREF_PHYS,
+ CONFIG_PCI_PREF_SIZE,
+ PCI_REGION_PREFETCH);
+
+ pci_set_region(hose->regions + 3,
+ 0,
+ 0,
+ gd->ram_size,
+ PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+
+ hose->region_count = 4;
+}
+
+int board_pci_post_scan(struct pci_controller *hose)
+{
+ return 0;
+}
diff --git a/arch/x86/cpu/qemu/qemu.c b/arch/x86/cpu/qemu/qemu.c
new file mode 100644
index 0000000..0f98476
--- /dev/null
+++ b/arch/x86/cpu/qemu/qemu.c
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/post.h>
+#include <asm/processor.h>
+
+int arch_cpu_init(void)
+{
+ int ret;
+
+ post_code(POST_CPU_INIT);
+#ifdef CONFIG_SYS_X86_TSC_TIMER
+ timer_set_base(rdtsc());
+#endif
+
+ ret = x86_cpu_init_f();
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+int print_cpuinfo(void)
+{
+ post_code(POST_CPU_INFO);
+ return default_print_cpuinfo();
+}
+
+void reset_cpu(ulong addr)
+{
+ /* cold reset */
+ x86_full_reset();
+}