From e76bf38f180b0c9325b17506f1518329d82cbed8 Mon Sep 17 00:00:00 2001
From: Bin Meng <bmeng.cn@gmail.com>
Date: Fri, 21 Apr 2017 07:24:36 -0700
Subject: x86: acpi: Add one API to find OS wakeup vector

This adds one API acpi_find_wakeup_vector() to locate OS wakeup
vector from the ACPI FACS table, to be used in the S3 boot path.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Stefan Roese <sr@denx.de>

diff --git a/arch/x86/include/asm/acpi_table.h b/arch/x86/include/asm/acpi_table.h
index bbd80a1..20b906c 100644
--- a/arch/x86/include/asm/acpi_table.h
+++ b/arch/x86/include/asm/acpi_table.h
@@ -317,3 +317,13 @@ int acpi_create_madt_lapic_nmi(struct acpi_madt_lapic_nmi *lapic_nmi,
 u32 acpi_fill_madt(u32 current);
 void acpi_create_gnvs(struct acpi_global_nvs *gnvs);
 ulong write_acpi_tables(ulong start);
+
+/**
+ * acpi_find_wakeup_vector() - find OS installed wake up vector address
+ *
+ * This routine parses the ACPI table to locate the wake up vector installed
+ * by the OS previously.
+ *
+ * @return:	wake up vector address installed by the OS
+ */
+void *acpi_find_wakeup_vector(void);
diff --git a/arch/x86/include/asm/tables.h b/arch/x86/include/asm/tables.h
index d1b2388..9e8208b 100644
--- a/arch/x86/include/asm/tables.h
+++ b/arch/x86/include/asm/tables.h
@@ -15,6 +15,7 @@
  * PIRQ routing table, Multi-Processor table and ACPI table.
  */
 #define ROM_TABLE_ADDR	0xf0000
+#define ROM_TABLE_END	0xfffff
 
 #define ROM_TABLE_ALIGN	1024
 
diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c
index 355456d..f118345 100644
--- a/arch/x86/lib/acpi_table.c
+++ b/arch/x86/lib/acpi_table.c
@@ -438,3 +438,75 @@ ulong write_acpi_tables(ulong start)
 
 	return current;
 }
+
+static struct acpi_rsdp *acpi_valid_rsdp(struct acpi_rsdp *rsdp)
+{
+	if (strncmp((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0)
+		return NULL;
+
+	debug("Looking on %p for valid checksum\n", rsdp);
+
+	if (table_compute_checksum((void *)rsdp, 20) != 0)
+		return NULL;
+	debug("acpi rsdp checksum 1 passed\n");
+
+	if ((rsdp->revision > 1) &&
+	    (table_compute_checksum((void *)rsdp, rsdp->length) != 0))
+		return NULL;
+	debug("acpi rsdp checksum 2 passed\n");
+
+	return rsdp;
+}
+
+void *acpi_find_wakeup_vector(void)
+{
+	char *p, *end;
+	struct acpi_rsdp *rsdp = NULL;
+	struct acpi_rsdt *rsdt;
+	struct acpi_fadt *fadt = NULL;
+	struct acpi_facs *facs;
+	void *wake_vec;
+	int i;
+
+	debug("Trying to find the wakeup vector...\n");
+
+	/* Find RSDP */
+	for (p = (char *)ROM_TABLE_ADDR; p < (char *)ROM_TABLE_END; p += 16) {
+		rsdp = acpi_valid_rsdp((struct acpi_rsdp *)p);
+		if (rsdp)
+			break;
+	}
+
+	if (rsdp == NULL)
+		return NULL;
+
+	debug("RSDP found at %p\n", rsdp);
+	rsdt = (struct acpi_rsdt *)rsdp->rsdt_address;
+
+	end = (char *)rsdt + rsdt->header.length;
+	debug("RSDT found at %p ends at %p\n", rsdt, end);
+
+	for (i = 0; ((char *)&rsdt->entry[i]) < end; i++) {
+		fadt = (struct acpi_fadt *)rsdt->entry[i];
+		if (strncmp((char *)fadt, "FACP", 4) == 0)
+			break;
+		fadt = NULL;
+	}
+
+	if (fadt == NULL)
+		return NULL;
+
+	debug("FADT found at %p\n", fadt);
+	facs = (struct acpi_facs *)fadt->firmware_ctrl;
+
+	if (facs == NULL) {
+		debug("No FACS found, wake up from S3 not possible.\n");
+		return NULL;
+	}
+
+	debug("FACS found at %p\n", facs);
+	wake_vec = (void *)facs->firmware_waking_vector;
+	debug("OS waking vector is %p\n", wake_vec);
+
+	return wake_vec;
+}
-- 
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