lib/bootmem: Add more bootmem tags

Introduce new bootmem tags to allow more fine grained control over buffer
allocation on various platforms. The new tags are:

BM_MEM_RAMSTAGE : Memory where any kind of boot firmware resides and that
                  should not be touched by bootmem (by example: stack,
                  TTB, program, ...).
BM_MEM_PAYLOAD  : Memory where any kind of payload resides and that should
                  not be touched by bootmem.

Starting with this commit all bootmem methods will no longer see memory
that is used by coreboot as usable RAM.

Bootmem changes:
* Introduce a weak function to add platform specific memranges.
* Mark memory allocated by bootmem as BM_TAG_PAYLOAD.
* Assert on failures.
* Add _stack and _program as BM_MEM_RAMSTAGE.

ARMv7 and ARMv8 specific changes:
* Add _ttb and _postram_cbfs_cache as BM_MEM_RAMSTAGE.

ARMv7 specific changes:
* Add _ttb_subtables as BM_MEM_RAMSTAGE.

Change-Id: I0c983ce43616147c519a43edee3b61d54eadbb9a
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/25383
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/lib/bootmem.c

@@ -20,9 +20,11 @@
 #include <cbmem.h>
 #include <device/resource.h>
 #include <stdlib.h>
+#include <symbols.h>
 #include <assert.h>
 
 static int initialized;
+static int table_written;
 static struct memranges bootmem;
 
 static int bootmem_is_initialized(void)
@@ -30,6 +32,16 @@ static int bootmem_is_initialized(void)
 	return initialized;
 }
 
+static int bootmem_memory_table_written(void)
+{
+	return table_written;
+}
+
+/* Platform hook to add bootmem areas the platform / board controls. */
+void __attribute__((weak)) bootmem_platform_add_ranges(void)
+{
+}
+
 /* Convert bootmem tag to LB_MEM tag */
 static uint32_t bootmem_to_lb_tag(const enum bootmem_type tag)
 {
@@ -73,7 +85,12 @@ static void bootmem_init(void)
 	/* Add memory used by CBMEM. */
 	cbmem_add_bootmem();
 
+	/* Add memory used by coreboot. */
+	bootmem_add_range((uintptr_t)_stack, _stack_size, BM_MEM_RAMSTAGE);
+	bootmem_add_range((uintptr_t)_program, _program_size, BM_MEM_RAMSTAGE);
+
 	bootmem_arch_add_ranges();
+	bootmem_platform_add_ranges();
 }
 
 void bootmem_add_range(uint64_t start, uint64_t size,
@@ -81,6 +98,8 @@ void bootmem_add_range(uint64_t start, uint64_t size,
 {
 	assert(tag > BM_MEM_FIRST && tag < BM_MEM_LAST);
 	assert(bootmem_is_initialized());
+	assert(!bootmem_memory_table_written() || tag == BM_MEM_RAMSTAGE ||
+		    tag == BM_MEM_PAYLOAD);
 
 	memranges_insert(&bootmem, start, size, tag);
 }
@@ -89,13 +108,22 @@ void bootmem_write_memory_table(struct lb_memory *mem)
 {
 	const struct range_entry *r;
 	struct lb_memory_range *lb_r;
+	struct memranges bm;
 
 	lb_r = &mem->map[0];
 
 	bootmem_init();
 	bootmem_dump_ranges();
 
-	memranges_each_entry(r, &bootmem) {
+	/**
+	 * Convert BM_MEM_RAMSTAGE and BM_MEM_PAYLOAD to BM_MEM_RAM and
+	 * merge ranges. The payload doesn't care about memory used by firmware.
+	 */
+	memranges_clone(&bm, &bootmem);
+	memranges_update_tag(&bm, BM_MEM_RAMSTAGE, BM_MEM_RAM);
+	memranges_update_tag(&bm, BM_MEM_PAYLOAD, BM_MEM_RAM);
+
+	memranges_each_entry(r, &bm) {
 		lb_r->start = pack_lb64(range_entry_base(r));
 		lb_r->size = pack_lb64(range_entry_size(r));
 		lb_r->type = bootmem_to_lb_tag(range_entry_tag(r));
@@ -103,6 +131,10 @@ void bootmem_write_memory_table(struct lb_memory *mem)
 		lb_r++;
 		mem->size += sizeof(struct lb_memory_range);
 	}
+
+	memranges_teardown(&bm);
+
+	table_written = 1;
 }
 
 struct range_strings {
@@ -118,6 +150,8 @@ static const struct range_strings type_strings[] = {
 	{ BM_MEM_UNUSABLE, "UNUSABLE" },
 	{ BM_MEM_VENDOR_RSVD, "VENDOR RESERVED" },
 	{ BM_MEM_TABLE, "CONFIGURATION TABLES" },
+	{ BM_MEM_RAMSTAGE, "RAM, RAMSTAGE" },
+	{ BM_MEM_PAYLOAD, "RAM, PAYLOAD" },
 };
 
 static const char *bootmem_range_string(const enum bootmem_type tag)
@@ -212,7 +246,7 @@ void *bootmem_allocate_buffer(size_t size)
 	begin = end - size;
 
 	/* Mark buffer as unusuable for future buffer use. */
-	bootmem_add_range(begin, size, BM_MEM_UNUSABLE);
+	bootmem_add_range(begin, size, BM_MEM_PAYLOAD);
 
 	return (void *)(uintptr_t)begin;
 }