From a8a8e9af574c63fbecf4719e3bf184795dc98c51 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Corvin=20K=C3=B6hne?= <corvink@FreeBSD.org>
Date: Thu, 9 Sep 2021 11:37:03 +0200
Subject: [PATCH] bhyve: add E820 dump function

For debugging purposes it is helpful to dump the E820 table.

Reviewed by:		markj
MFC after:		1 week
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D39549
---
 usr.sbin/bhyve/e820.c | 35 +++++++++++++++++++++++++++++++++++
 usr.sbin/bhyve/e820.h |  1 +
 2 files changed, 36 insertions(+)

diff --git a/usr.sbin/bhyve/e820.c b/usr.sbin/bhyve/e820.c
index 922381d032c..6c43e6eda3a 100644
--- a/usr.sbin/bhyve/e820.c
+++ b/usr.sbin/bhyve/e820.c
@@ -70,6 +70,41 @@ e820_element_alloc(uint64_t base, uint64_t end, enum e820_memory_type type)
 	return (element);
 }
 
+static const char *
+e820_get_type_name(const enum e820_memory_type type)
+{
+	switch (type) {
+	case E820_TYPE_MEMORY:
+		return ("RAM");
+	case E820_TYPE_RESERVED:
+		return ("Reserved");
+	case E820_TYPE_ACPI:
+		return ("ACPI");
+	case E820_TYPE_NVS:
+		return ("NVS");
+	default:
+		return ("Unknown");
+	}
+}
+
+void
+e820_dump_table(void)
+{
+	struct e820_element *element;
+	uint64_t i;
+
+	fprintf(stderr, "E820 map:\n");
+	
+	i = 0;
+	TAILQ_FOREACH(element, &e820_table, chain) {
+		fprintf(stderr, "  (%4lu) [%16lx, %16lx] %s\n", i,
+		    element->base, element->end,
+		    e820_get_type_name(element->type));
+
+		++i;
+	}
+}
+
 struct qemu_fwcfg_item *
 e820_get_fwcfg_item(void)
 {
diff --git a/usr.sbin/bhyve/e820.h b/usr.sbin/bhyve/e820.h
index 8b8e23422e1..8703a55115c 100644
--- a/usr.sbin/bhyve/e820.h
+++ b/usr.sbin/bhyve/e820.h
@@ -40,5 +40,6 @@ struct e820_entry {
 uint64_t e820_alloc(const uint64_t address, const uint64_t length,
     const uint64_t alignment, const enum e820_memory_type type,
     const enum e820_allocation_strategy strategy);
+void e820_dump_table(void);
 struct qemu_fwcfg_item *e820_get_fwcfg_item(void);
 int e820_init(struct vmctx *const ctx);