test/lib/lmb.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2018 Simon Goldschmidt
  */

 #include <common.h>
 #include <lmb.h>
 #include <dm/test.h>
 #include <test/ut.h>

 static int check_lmb(struct unit_test_state *uts, struct lmb *lmb,
 		     phys_addr_t ram_base, phys_size_t ram_size,
 		     unsigned long num_reserved,
 		     phys_addr_t base1, phys_size_t size1,
 		     phys_addr_t base2, phys_size_t size2,
 		     phys_addr_t base3, phys_size_t size3)
 {
 	ut_asserteq(lmb->memory.cnt, 1);
 	ut_asserteq(lmb->memory.region[0].base, ram_base);
 	ut_asserteq(lmb->memory.region[0].size, ram_size);

 	ut_asserteq(lmb->reserved.cnt, num_reserved);
 	if (num_reserved > 0) {
 		ut_asserteq(lmb->reserved.region[0].base, base1);
 		ut_asserteq(lmb->reserved.region[0].size, size1);
 	}
 	if (num_reserved > 1) {
 		ut_asserteq(lmb->reserved.region[1].base, base2);
 		ut_asserteq(lmb->reserved.region[1].size, size2);
 	}
 	if (num_reserved > 2) {
 		ut_asserteq(lmb->reserved.region[2].base, base3);
 		ut_asserteq(lmb->reserved.region[2].size, size3);
 	}
 	return 0;
 }

 #define ASSERT_LMB(lmb, ram_base, ram_size, num_reserved, base1, size1, \
 		   base2, size2, base3, size3) \
 		   ut_assert(!check_lmb(uts, lmb, ram_base, ram_size, \
 			     num_reserved, base1, size1, base2, size2, base3, \
 			     size3))

 /*
  * Test helper function that reserves 64 KiB somewhere in the simulated RAM and
  * then does some alloc + free tests.
  */
 static int test_multi_alloc(struct unit_test_state *uts,
 			    const phys_addr_t ram, const phys_size_t ram_size,
 			    const phys_addr_t alloc_64k_addr)
 {
 	const phys_addr_t ram_end = ram + ram_size;
 	const phys_addr_t alloc_64k_end = alloc_64k_addr + 0x10000;

 	struct lmb lmb;
 	long ret;
 	phys_addr_t a, a2, b, b2, c, d;

 	/* check for overflow */
 	ut_assert(ram_end == 0 || ram_end > ram);
 	ut_assert(alloc_64k_end > alloc_64k_addr);
 	/* check input addresses + size */
 	ut_assert(alloc_64k_addr >= ram + 8);
 	ut_assert(alloc_64k_end <= ram_end - 8);

 	lmb_init(&lmb);

 	ret = lmb_add(&lmb, ram, ram_size);
 	ut_asserteq(ret, 0);

 	/* reserve 64KiB somewhere */
 	ret = lmb_reserve(&lmb, alloc_64k_addr, 0x10000);
 	ut_asserteq(ret, 0);
 	ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000,
 		   0, 0, 0, 0);

 	/* allocate somewhere, should be at the end of RAM */
 	a = lmb_alloc(&lmb, 4, 1);
 	ut_asserteq(a, ram_end - 4);
 	ASSERT_LMB(&lmb, ram, ram_size, 2, alloc_64k_addr, 0x10000,
 		   ram_end - 4, 4, 0, 0);
 	/* alloc below end of reserved region -> below reserved region */
 	b = lmb_alloc_base(&lmb, 4, 1, alloc_64k_end);
 	ut_asserteq(b, alloc_64k_addr - 4);
 	ASSERT_LMB(&lmb, ram, ram_size, 2,
 		   alloc_64k_addr - 4, 0x10000 + 4, ram_end - 4, 4, 0, 0);

 	/* 2nd time */
 	c = lmb_alloc(&lmb, 4, 1);
 	ut_asserteq(c, ram_end - 8);
 	ASSERT_LMB(&lmb, ram, ram_size, 2,
 		   alloc_64k_addr - 4, 0x10000 + 4, ram_end - 8, 8, 0, 0);
 	d = lmb_alloc_base(&lmb, 4, 1, alloc_64k_end);
 	ut_asserteq(d, alloc_64k_addr - 8);
 	ASSERT_LMB(&lmb, ram, ram_size, 2,
 		   alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 8, 0, 0);

 	ret = lmb_free(&lmb, a, 4);
 	ut_asserteq(ret, 0);
 	ASSERT_LMB(&lmb, ram, ram_size, 2,
 		   alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 4, 0, 0);
 	/* allocate again to ensure we get the same address */
 	a2 = lmb_alloc(&lmb, 4, 1);
 	ut_asserteq(a, a2);
 	ASSERT_LMB(&lmb, ram, ram_size, 2,
 		   alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 8, 0, 0);
 	ret = lmb_free(&lmb, a2, 4);
 	ut_asserteq(ret, 0);
 	ASSERT_LMB(&lmb, ram, ram_size, 2,
 		   alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 4, 0, 0);

 	ret = lmb_free(&lmb, b, 4);
 	ut_asserteq(ret, 0);
 	ASSERT_LMB(&lmb, ram, ram_size, 3,
 		   alloc_64k_addr - 8, 4, alloc_64k_addr, 0x10000,
 		   ram_end - 8, 4);
 	/* allocate again to ensure we get the same address */
 	b2 = lmb_alloc_base(&lmb, 4, 1, alloc_64k_end);
 	ut_asserteq(b, b2);
 	ASSERT_LMB(&lmb, ram, ram_size, 2,
 		   alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 4, 0, 0);
 	ret = lmb_free(&lmb, b2, 4);
 	ut_asserteq(ret, 0);
 	ASSERT_LMB(&lmb, ram, ram_size, 3,
 		   alloc_64k_addr - 8, 4, alloc_64k_addr, 0x10000,
 		   ram_end - 8, 4);

 	ret = lmb_free(&lmb, c, 4);
 	ut_asserteq(ret, 0);
 	ASSERT_LMB(&lmb, ram, ram_size, 2,
 		   alloc_64k_addr - 8, 4, alloc_64k_addr, 0x10000, 0, 0);
 	ret = lmb_free(&lmb, d, 4);
 	ut_asserteq(ret, 0);
 	ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000,
 		   0, 0, 0, 0);

 	return 0;
 }

 static int test_multi_alloc_512mb(struct unit_test_state *uts,
 				  const phys_addr_t ram)
 {
 	return test_multi_alloc(uts, ram, 0x20000000, ram + 0x10000000);
 }

 /* Create a memory region with one reserved region and allocate */
 static int lib_test_lmb_simple(struct unit_test_state *uts)
 {
 	/* simulate 512 MiB RAM beginning at 1GiB */
 	return test_multi_alloc_512mb(uts, 0x40000000);
 }

 DM_TEST(lib_test_lmb_simple, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 /* Simulate 512 MiB RAM, allocate some blocks that fit/don't fit */
 static int test_bigblock(struct unit_test_state *uts, const phys_addr_t ram)
 {
 	const phys_size_t ram_size = 0x20000000;
 	const phys_size_t big_block_size = 0x10000000;
 	const phys_addr_t ram_end = ram + ram_size;
 	const phys_addr_t alloc_64k_addr = ram + 0x10000000;
 	struct lmb lmb;
 	long ret;
 	phys_addr_t a, b;

 	/* check for overflow */
 	ut_assert(ram_end == 0 || ram_end > ram);

 	lmb_init(&lmb);

 	ret = lmb_add(&lmb, ram, ram_size);
 	ut_asserteq(ret, 0);

 	/* reserve 64KiB in the middle of RAM */
 	ret = lmb_reserve(&lmb, alloc_64k_addr, 0x10000);
 	ut_asserteq(ret, 0);
 	ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000,
 		   0, 0, 0, 0);

 	/* allocate a big block, should be below reserved */
 	a = lmb_alloc(&lmb, big_block_size, 1);
 	ut_asserteq(a, ram);
 	ASSERT_LMB(&lmb, ram, ram_size, 1, a,
 		   big_block_size + 0x10000, 0, 0, 0, 0);
 	/* allocate 2nd big block */
 	/* This should fail, printing an error */
 	b = lmb_alloc(&lmb, big_block_size, 1);
 	ut_asserteq(b, 0);
 	ASSERT_LMB(&lmb, ram, ram_size, 1, a,
 		   big_block_size + 0x10000, 0, 0, 0, 0);

 	ret = lmb_free(&lmb, a, big_block_size);
 	ut_asserteq(ret, 0);
 	ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000,
 		   0, 0, 0, 0);

 	/* allocate too big block */
 	/* This should fail, printing an error */
 	a = lmb_alloc(&lmb, ram_size, 1);
 	ut_asserteq(a, 0);
 	ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000,
 		   0, 0, 0, 0);

 	return 0;
 }

 static int lib_test_lmb_big(struct unit_test_state *uts)
 {
 	return test_bigblock(uts, 0x40000000);
 }

 DM_TEST(lib_test_lmb_big, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 /* Simulate 512 MiB RAM, allocate a block without previous reservation */
 static int test_noreserved(struct unit_test_state *uts, const phys_addr_t ram)
 {
 	const phys_size_t ram_size = 0x20000000;
 	const phys_addr_t ram_end = ram + ram_size;
 	struct lmb lmb;
 	long ret;
 	phys_addr_t a, b;

 	/* check for overflow */
 	ut_assert(ram_end == 0 || ram_end > ram);

 	lmb_init(&lmb);

 	ret = lmb_add(&lmb, ram, ram_size);
 	ut_asserteq(ret, 0);

 	/* allocate a block */
 	a = lmb_alloc(&lmb, 4, 1);
 	ut_assert(a != 0);
 	/* and free it */
 	ret = lmb_free(&lmb, a, 4);
 	ut_asserteq(ret, 0);

 	/* allocate a block with base*/
 	b = lmb_alloc_base(&lmb, 4, 1, ram_end);
 	ut_assert(a == b);
 	/* and free it */
 	ret = lmb_free(&lmb, b, 4);
 	ut_asserteq(ret, 0);

 	return 0;
 }

 static int lib_test_lmb_noreserved(struct unit_test_state *uts)
 {
 	return test_noreserved(uts, 0x40000000);
 }

 DM_TEST(lib_test_lmb_noreserved, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

 /*
  * Simulate a RAM that starts at 0 and allocate down to address 0, which must
  * fail as '0' means failure for the lmb_alloc functions.
  */
 static int lib_test_lmb_at_0(struct unit_test_state *uts)
 {
 	const phys_addr_t ram = 0;
 	const phys_size_t ram_size = 0x20000000;
 	struct lmb lmb;
 	long ret;
 	phys_addr_t a, b;

 	lmb_init(&lmb);

 	ret = lmb_add(&lmb, ram, ram_size);
 	ut_asserteq(ret, 0);

 	/* allocate nearly everything */
 	a = lmb_alloc(&lmb, ram_size - 4, 1);
 	ut_asserteq(a, ram + 4);
 	ASSERT_LMB(&lmb, ram, ram_size, 1, a, ram_size - 4,
 		   0, 0, 0, 0);
 	/* allocate the rest */
 	/* This should fail as the allocated address would be 0 */
 	b = lmb_alloc(&lmb, 4, 1);
 	ut_asserteq(b, 0);
 	/* check that this was an error by checking lmb */
 	ASSERT_LMB(&lmb, ram, ram_size, 1, a, ram_size - 4,
 		   0, 0, 0, 0);
 	/* check that this was an error by freeing b */
 	ret = lmb_free(&lmb, b, 4);
 	ut_asserteq(ret, -1);
 	ASSERT_LMB(&lmb, ram, ram_size, 1, a, ram_size - 4,
 		   0, 0, 0, 0);

 	ret = lmb_free(&lmb, a, ram_size - 4);
 	ut_asserteq(ret, 0);
 	ASSERT_LMB(&lmb, ram, ram_size, 0, 0, 0, 0, 0, 0, 0);

 	return 0;
 }

 DM_TEST(lib_test_lmb_at_0, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (C) Copyright 2018 Simon Goldschmidt
	*/

	#include <common.h>
	#include <lmb.h>
	#include <dm/test.h>
	#include <test/ut.h>

	static int check_lmb(struct unit_test_state uts, struct lmb lmb,
	phys_addr_t ram_base, phys_size_t ram_size,
	unsigned long num_reserved,
	phys_addr_t base1, phys_size_t size1,
	phys_addr_t base2, phys_size_t size2,
	phys_addr_t base3, phys_size_t size3)
	{
	ut_asserteq(lmb->memory.cnt, 1);
	ut_asserteq(lmb->memory.region[0].base, ram_base);
	ut_asserteq(lmb->memory.region[0].size, ram_size);

	ut_asserteq(lmb->reserved.cnt, num_reserved);
	if (num_reserved > 0) {
	ut_asserteq(lmb->reserved.region[0].base, base1);
	ut_asserteq(lmb->reserved.region[0].size, size1);
	}
	if (num_reserved > 1) {
	ut_asserteq(lmb->reserved.region[1].base, base2);
	ut_asserteq(lmb->reserved.region[1].size, size2);
	}
	if (num_reserved > 2) {
	ut_asserteq(lmb->reserved.region[2].base, base3);
	ut_asserteq(lmb->reserved.region[2].size, size3);
	}
	return 0;
	}

	#define ASSERT_LMB(lmb, ram_base, ram_size, num_reserved, base1, size1, \
	base2, size2, base3, size3) \
	ut_assert(!check_lmb(uts, lmb, ram_base, ram_size, \
	num_reserved, base1, size1, base2, size2, base3, \
	size3))

	/*
	* Test helper function that reserves 64 KiB somewhere in the simulated RAM and
	* then does some alloc + free tests.
	*/
	static int test_multi_alloc(struct unit_test_state *uts,
	const phys_addr_t ram, const phys_size_t ram_size,
	const phys_addr_t alloc_64k_addr)
	{
	const phys_addr_t ram_end = ram + ram_size;
	const phys_addr_t alloc_64k_end = alloc_64k_addr + 0x10000;

	struct lmb lmb;
	long ret;
	phys_addr_t a, a2, b, b2, c, d;

	/* check for overflow */
	ut_assert(ram_end == 0 \|\| ram_end > ram);
	ut_assert(alloc_64k_end > alloc_64k_addr);
	/* check input addresses + size */
	ut_assert(alloc_64k_addr >= ram + 8);
	ut_assert(alloc_64k_end <= ram_end - 8);

	lmb_init(&lmb);

	ret = lmb_add(&lmb, ram, ram_size);
	ut_asserteq(ret, 0);

	/* reserve 64KiB somewhere */
	ret = lmb_reserve(&lmb, alloc_64k_addr, 0x10000);
	ut_asserteq(ret, 0);
	ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000,
	0, 0, 0, 0);

	/* allocate somewhere, should be at the end of RAM */
	a = lmb_alloc(&lmb, 4, 1);
	ut_asserteq(a, ram_end - 4);
	ASSERT_LMB(&lmb, ram, ram_size, 2, alloc_64k_addr, 0x10000,
	ram_end - 4, 4, 0, 0);
	/* alloc below end of reserved region -> below reserved region */
	b = lmb_alloc_base(&lmb, 4, 1, alloc_64k_end);
	ut_asserteq(b, alloc_64k_addr - 4);
	ASSERT_LMB(&lmb, ram, ram_size, 2,
	alloc_64k_addr - 4, 0x10000 + 4, ram_end - 4, 4, 0, 0);

	/* 2nd time */
	c = lmb_alloc(&lmb, 4, 1);
	ut_asserteq(c, ram_end - 8);
	ASSERT_LMB(&lmb, ram, ram_size, 2,
	alloc_64k_addr - 4, 0x10000 + 4, ram_end - 8, 8, 0, 0);
	d = lmb_alloc_base(&lmb, 4, 1, alloc_64k_end);
	ut_asserteq(d, alloc_64k_addr - 8);
	ASSERT_LMB(&lmb, ram, ram_size, 2,
	alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 8, 0, 0);

	ret = lmb_free(&lmb, a, 4);
	ut_asserteq(ret, 0);
	ASSERT_LMB(&lmb, ram, ram_size, 2,
	alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 4, 0, 0);
	/* allocate again to ensure we get the same address */
	a2 = lmb_alloc(&lmb, 4, 1);
	ut_asserteq(a, a2);
	ASSERT_LMB(&lmb, ram, ram_size, 2,
	alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 8, 0, 0);
	ret = lmb_free(&lmb, a2, 4);
	ut_asserteq(ret, 0);
	ASSERT_LMB(&lmb, ram, ram_size, 2,
	alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 4, 0, 0);

	ret = lmb_free(&lmb, b, 4);
	ut_asserteq(ret, 0);
	ASSERT_LMB(&lmb, ram, ram_size, 3,
	alloc_64k_addr - 8, 4, alloc_64k_addr, 0x10000,
	ram_end - 8, 4);
	/* allocate again to ensure we get the same address */
	b2 = lmb_alloc_base(&lmb, 4, 1, alloc_64k_end);
	ut_asserteq(b, b2);
	ASSERT_LMB(&lmb, ram, ram_size, 2,
	alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 4, 0, 0);
	ret = lmb_free(&lmb, b2, 4);
	ut_asserteq(ret, 0);
	ASSERT_LMB(&lmb, ram, ram_size, 3,
	alloc_64k_addr - 8, 4, alloc_64k_addr, 0x10000,
	ram_end - 8, 4);

	ret = lmb_free(&lmb, c, 4);
	ut_asserteq(ret, 0);
	ASSERT_LMB(&lmb, ram, ram_size, 2,
	alloc_64k_addr - 8, 4, alloc_64k_addr, 0x10000, 0, 0);
	ret = lmb_free(&lmb, d, 4);
	ut_asserteq(ret, 0);
	ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000,
	0, 0, 0, 0);

	return 0;
	}

	static int test_multi_alloc_512mb(struct unit_test_state *uts,
	const phys_addr_t ram)
	{
	return test_multi_alloc(uts, ram, 0x20000000, ram + 0x10000000);
	}

	/* Create a memory region with one reserved region and allocate */
	static int lib_test_lmb_simple(struct unit_test_state *uts)
	{
	/* simulate 512 MiB RAM beginning at 1GiB */
	return test_multi_alloc_512mb(uts, 0x40000000);
	}

	DM_TEST(lib_test_lmb_simple, DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	/* Simulate 512 MiB RAM, allocate some blocks that fit/don't fit */
	static int test_bigblock(struct unit_test_state *uts, const phys_addr_t ram)
	{
	const phys_size_t ram_size = 0x20000000;
	const phys_size_t big_block_size = 0x10000000;
	const phys_addr_t ram_end = ram + ram_size;
	const phys_addr_t alloc_64k_addr = ram + 0x10000000;
	struct lmb lmb;
	long ret;
	phys_addr_t a, b;

	/* check for overflow */
	ut_assert(ram_end == 0 \|\| ram_end > ram);

	lmb_init(&lmb);

	ret = lmb_add(&lmb, ram, ram_size);
	ut_asserteq(ret, 0);

	/* reserve 64KiB in the middle of RAM */
	ret = lmb_reserve(&lmb, alloc_64k_addr, 0x10000);
	ut_asserteq(ret, 0);
	ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000,
	0, 0, 0, 0);

	/* allocate a big block, should be below reserved */
	a = lmb_alloc(&lmb, big_block_size, 1);
	ut_asserteq(a, ram);
	ASSERT_LMB(&lmb, ram, ram_size, 1, a,
	big_block_size + 0x10000, 0, 0, 0, 0);
	/* allocate 2nd big block */
	/* This should fail, printing an error */
	b = lmb_alloc(&lmb, big_block_size, 1);
	ut_asserteq(b, 0);
	ASSERT_LMB(&lmb, ram, ram_size, 1, a,
	big_block_size + 0x10000, 0, 0, 0, 0);

	ret = lmb_free(&lmb, a, big_block_size);
	ut_asserteq(ret, 0);
	ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000,
	0, 0, 0, 0);

	/* allocate too big block */
	/* This should fail, printing an error */
	a = lmb_alloc(&lmb, ram_size, 1);
	ut_asserteq(a, 0);
	ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000,
	0, 0, 0, 0);

	return 0;
	}

	static int lib_test_lmb_big(struct unit_test_state *uts)
	{
	return test_bigblock(uts, 0x40000000);
	}

	DM_TEST(lib_test_lmb_big, DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	/* Simulate 512 MiB RAM, allocate a block without previous reservation */
	static int test_noreserved(struct unit_test_state *uts, const phys_addr_t ram)
	{
	const phys_size_t ram_size = 0x20000000;
	const phys_addr_t ram_end = ram + ram_size;
	struct lmb lmb;
	long ret;
	phys_addr_t a, b;

	/* check for overflow */
	ut_assert(ram_end == 0 \|\| ram_end > ram);

	lmb_init(&lmb);

	ret = lmb_add(&lmb, ram, ram_size);
	ut_asserteq(ret, 0);

	/* allocate a block */
	a = lmb_alloc(&lmb, 4, 1);
	ut_assert(a != 0);
	/* and free it */
	ret = lmb_free(&lmb, a, 4);
	ut_asserteq(ret, 0);

	/* allocate a block with base*/
	b = lmb_alloc_base(&lmb, 4, 1, ram_end);
	ut_assert(a == b);
	/* and free it */
	ret = lmb_free(&lmb, b, 4);
	ut_asserteq(ret, 0);

	return 0;
	}

	static int lib_test_lmb_noreserved(struct unit_test_state *uts)
	{
	return test_noreserved(uts, 0x40000000);
	}

	DM_TEST(lib_test_lmb_noreserved, DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);

	/*
	* Simulate a RAM that starts at 0 and allocate down to address 0, which must
	* fail as '0' means failure for the lmb_alloc functions.
	*/
	static int lib_test_lmb_at_0(struct unit_test_state *uts)
	{
	const phys_addr_t ram = 0;
	const phys_size_t ram_size = 0x20000000;
	struct lmb lmb;
	long ret;
	phys_addr_t a, b;

	lmb_init(&lmb);

	ret = lmb_add(&lmb, ram, ram_size);
	ut_asserteq(ret, 0);

	/* allocate nearly everything */
	a = lmb_alloc(&lmb, ram_size - 4, 1);
	ut_asserteq(a, ram + 4);
	ASSERT_LMB(&lmb, ram, ram_size, 1, a, ram_size - 4,
	0, 0, 0, 0);
	/* allocate the rest */
	/* This should fail as the allocated address would be 0 */
	b = lmb_alloc(&lmb, 4, 1);
	ut_asserteq(b, 0);
	/* check that this was an error by checking lmb */
	ASSERT_LMB(&lmb, ram, ram_size, 1, a, ram_size - 4,
	0, 0, 0, 0);
	/* check that this was an error by freeing b */
	ret = lmb_free(&lmb, b, 4);
	ut_asserteq(ret, -1);
	ASSERT_LMB(&lmb, ram, ram_size, 1, a, ram_size - 4,
	0, 0, 0, 0);

	ret = lmb_free(&lmb, a, ram_size - 4);
	ut_asserteq(ret, 0);
	ASSERT_LMB(&lmb, ram, ram_size, 0, 0, 0, 0, 0, 0, 0);

	return 0;
	}

	DM_TEST(lib_test_lmb_at_0, DM_TESTF_SCAN_PDATA \| DM_TESTF_SCAN_FDT);