x86: broadwell: Add reference code support
Broadwell needs a special binary blob to set up the PCH. Add code to run
this on start-up.
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/cpu/broadwell/Makefile b/arch/x86/cpu/broadwell/Makefile
index 3054a89..a542fef 100644
--- a/arch/x86/cpu/broadwell/Makefile
+++ b/arch/x86/cpu/broadwell/Makefile
@@ -10,4 +10,5 @@
obj-y += northbridge.o
obj-y += pch.o
obj-y += pinctrl_broadwell.o
+obj-y += refcode.o
obj-y += sata.o
diff --git a/arch/x86/cpu/broadwell/refcode.c b/arch/x86/cpu/broadwell/refcode.c
new file mode 100644
index 0000000..436c6c4
--- /dev/null
+++ b/arch/x86/cpu/broadwell/refcode.c
@@ -0,0 +1,113 @@
+/*
+ * Read a coreboot rmodule and execute it.
+ * The rmodule_header struct is from coreboot.
+ *
+ * Copyright (c) 2016 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <asm/arch/pei_data.h>
+
+#define RMODULE_MAGIC 0xf8fe
+#define RMODULE_VERSION_1 1
+
+/*
+ * All fields with '_offset' in the name are byte offsets into the flat blob.
+ * The linker and the linker script takes are of assigning the values.
+ */
+struct rmodule_header {
+ uint16_t magic;
+ uint8_t version;
+ uint8_t type;
+ /* The payload represents the program's loadable code and data */
+ uint32_t payload_begin_offset;
+ uint32_t payload_end_offset;
+ /* Begin and of relocation information about the program module */
+ uint32_t relocations_begin_offset;
+ uint32_t relocations_end_offset;
+ /*
+ * The starting address of the linked program. This address is vital
+ * for determining relocation offsets as the relocation info and other
+ * symbols (bss, entry point) need this value as a basis to calculate
+ * the offsets.
+ */
+ uint32_t module_link_start_address;
+ /*
+ * The module_program_size is the size of memory used while running
+ * the program. The program is assumed to consume a contiguous amount
+ * of memory
+ */
+ uint32_t module_program_size;
+ /* This is program's execution entry point */
+ uint32_t module_entry_point;
+ /*
+ * Optional parameter structure that can be used to pass data into
+ * the module
+ */
+ uint32_t parameters_begin;
+ uint32_t parameters_end;
+ /* BSS section information so the loader can clear the bss */
+ uint32_t bss_begin;
+ uint32_t bss_end;
+ /* Add some room for growth */
+ uint32_t padding[4];
+} __packed;
+
+int cpu_run_reference_code(void)
+{
+ struct pei_data _pei_data __aligned(8);
+ struct pei_data *pei_data = &_pei_data;
+ asmlinkage int (*func)(void *);
+ struct rmodule_header *hdr;
+ char *src, *dest;
+ int ret, dummy;
+ int size;
+
+ hdr = (struct rmodule_header *)CONFIG_X86_REFCODE_ADDR;
+ debug("Extracting code from rmodule at %p\n", hdr);
+ if (hdr->magic != RMODULE_MAGIC) {
+ debug("Invalid rmodule magic\n");
+ return -EINVAL;
+ }
+ if (hdr->module_link_start_address != 0) {
+ debug("Link start address must be 0\n");
+ return -EPERM;
+ }
+ if (hdr->module_entry_point != 0) {
+ debug("Entry point must be 0\n");
+ return -EPERM;
+ }
+
+ memset(pei_data, '\0', sizeof(struct pei_data));
+ broadwell_fill_pei_data(pei_data);
+ mainboard_fill_pei_data(pei_data);
+ pei_data->saved_data = (void *)&dummy;
+
+ src = (char *)hdr + hdr->payload_begin_offset;
+ dest = (char *)CONFIG_X86_REFCODE_RUN_ADDR;
+
+ size = hdr->payload_end_offset - hdr->payload_begin_offset;
+ debug("Copying refcode from %p to %p, size %x\n", src, dest, size);
+ memcpy(dest, src, size);
+
+ size = hdr->bss_end - hdr->bss_begin;
+ debug("Zeroing BSS at %p, size %x\n", dest + hdr->bss_begin, size);
+ memset(dest + hdr->bss_begin, '\0', size);
+
+ func = (asmlinkage int (*)(void *))dest;
+ debug("Running reference code at %p\n", func);
+#ifdef DEBUG
+ print_buffer(CONFIG_X86_REFCODE_RUN_ADDR, (void *)func, 1, 0x40, 0);
+#endif
+ ret = func(pei_data);
+ if (ret != 0) {
+ debug("Reference code returned %d\n", ret);
+ return -EL2HLT;
+ }
+ debug("Refereence code completed\n");
+
+ return 0;
+}