[PATCH 09/18] powerpc: Support device tree regardless of CPU endianness

Ian Munsie
2010-10-01T07:06:35Z

From: Ian Munsie <imunsie@au1.ibm.com>

On PowerPC the device tree is always big endian, but the CPU could be
either, so add be32_to_cpu where appropriate and change the types of
device tree data to __be32 etc to allow sparse to locate endian issues.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
---
arch/powerpc/kernel/prom.c | 60 ++++++++++++++++++++++----------------------
1 files changed, 30 insertions(+), 30 deletions(-)

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index fed9bf6..9b9ebb2 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -188,16 +188,16 @@ static void __init check_cpu_pa_features(unsigned long node)
#ifdef CONFIG_PPC_STD_MMU_64
static void __init check_cpu_slb_size(unsigned long node)
{
- u32 *slb_size_ptr;
+ __be32 *slb_size_ptr;

slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
if (slb_size_ptr != NULL) {
- mmu_slb_size = *slb_size_ptr;
+ mmu_slb_size = be32_to_cpup(slb_size_ptr);
return;
}
slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
if (slb_size_ptr != NULL) {
- mmu_slb_size = *slb_size_ptr;
+ mmu_slb_size = be32_to_cpup(slb_size_ptr);
}
}
#else
@@ -252,11 +252,11 @@ static void __init check_cpu_feature_properties(unsigned long node)
{
unsigned long i;
struct feature_property *fp = feature_properties;
- const u32 *prop;
+ const __be32 *prop;

for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
prop = of_get_flat_dt_prop(node, fp->name, NULL);
- if (prop && *prop >= fp->min_value) {
+ if (prop && be32_to_cpup(prop) >= fp->min_value) {
cur_cpu_spec->cpu_features |= fp->cpu_feature;
cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
}
@@ -269,8 +269,8 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
{
static int logical_cpuid = 0;
char *type = of_get_flat_dt_prop(node, "device_type", NULL);
- const u32 *prop;
- const u32 *intserv;
+ const __be32 *prop;
+ const __be32 *intserv;
int i, nthreads;
unsigned long len;
int found = 0;
@@ -297,9 +297,9 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
* version 2 of the kexec param format adds the phys cpuid of
* booted proc.
*/
- if (initial_boot_params && initial_boot_params->version >= 2) {
- if (intserv[i] ==
- initial_boot_params->boot_cpuid_phys) {
+ if (initial_boot_params && be32_to_cpu(initial_boot_params->version) >= 2) {
+ if (be32_to_cpu(intserv[i]) ==
+ be32_to_cpu(initial_boot_params->boot_cpuid_phys)) {
found = 1;
break;
}
@@ -324,9 +324,9 @@ static int __init early_init_dt_scan_cpus(unsigned long node,

if (found) {
DBG("boot cpu: logical %d physical %d\n", logical_cpuid,
- intserv[i]);
+ be32_to_cpu(intserv[i]));
boot_cpuid = logical_cpuid;
- set_hard_smp_processor_id(boot_cpuid, intserv[i]);
+ set_hard_smp_processor_id(boot_cpuid, be32_to_cpu(intserv[i]));

/*
* PAPR defines "logical" PVR values for cpus that
@@ -343,8 +343,8 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
* it uses 0x0f000001.
*/
prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
- if (prop && (*prop & 0xff000000) == 0x0f000000)
- identify_cpu(0, *prop);
+ if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
+ identify_cpu(0, be32_to_cpup(prop));

identical_pvr_fixup(node);
}
@@ -365,7 +365,7 @@ static int __init early_init_dt_scan_cpus(unsigned long node,

void __init early_init_dt_scan_chosen_arch(unsigned long node)
{
- unsigned long *lprop;
+ unsigned long *lprop; /* All these set by kernel, so no need to convert endian */

#ifdef CONFIG_PPC64
/* check if iommu is forced on or off */
@@ -524,16 +524,16 @@ void __init early_init_dt_setup_initrd_arch(unsigned long start,
static void __init early_reserve_mem(void)
{
u64 base, size;
- u64 *reserve_map;
+ __be64 *reserve_map;
unsigned long self_base;
unsigned long self_size;

- reserve_map = (u64 *)(((unsigned long)initial_boot_params) +
- initial_boot_params->off_mem_rsvmap);
+ reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
+ be32_to_cpu(initial_boot_params->off_mem_rsvmap));

/* before we do anything, lets reserve the dt blob */
self_base = __pa((unsigned long)initial_boot_params);
- self_size = initial_boot_params->totalsize;
+ self_size = be32_to_cpu(initial_boot_params->totalsize);
memblock_reserve(self_base, self_size);

#ifdef CONFIG_BLK_DEV_INITRD
@@ -547,13 +547,13 @@ static void __init early_reserve_mem(void)
* Handle the case where we might be booting from an old kexec
* image that setup the mem_rsvmap as pairs of 32-bit values
*/
- if (*reserve_map > 0xffffffffull) {
+ if (be64_to_cpup(reserve_map) > 0xffffffffull) {
u32 base_32, size_32;
- u32 *reserve_map_32 = (u32 *)reserve_map;
+ __be32 *reserve_map_32 = (__be32 *)reserve_map;

while (1) {
- base_32 = *(reserve_map_32++);
- size_32 = *(reserve_map_32++);
+ base_32 = be32_to_cpup(reserve_map_32++);
+ size_32 = be32_to_cpup(reserve_map_32++);
if (size_32 == 0)
break;
/* skip if the reservation is for the blob */
@@ -566,8 +566,8 @@ static void __init early_reserve_mem(void)
}
#endif
while (1) {
- base = *(reserve_map++);
- size = *(reserve_map++);
+ base = be64_to_cpup(reserve_map++);
+ size = be64_to_cpup(reserve_map++);
if (size == 0)
break;
DBG("reserving: %llx -> %llx\n", base, size);
@@ -860,7 +860,7 @@ struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
hardid = get_hard_smp_processor_id(cpu);

for_each_node_by_type(np, "cpu") {
- const u32 *intserv;
+ const __be32 *intserv;
unsigned int plen, t;

/* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
@@ -869,10 +869,10 @@ struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
intserv = of_get_property(np, "ibm,ppc-interrupt-server#s",
&plen);
if (intserv == NULL) {
- const u32 *reg = of_get_property(np, "reg", NULL);
+ const __be32 *reg = of_get_property(np, "reg", NULL);
if (reg == NULL)
continue;
- if (*reg == hardid) {
+ if (be32_to_cpup(reg) == hardid) {
if (thread)
*thread = 0;
return np;
@@ -880,7 +880,7 @@ struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
} else {
plen /= sizeof(u32);
for (t = 0; t < plen; t++) {
- if (hardid == intserv[t]) {
+ if (hardid == be32_to_cpu(intserv[t])) {
if (thread)
*thread = t;
return np;
@@ -900,7 +900,7 @@ static int __init export_flat_device_tree(void)
struct dentry *d;

flat_dt_blob.data = initial_boot_params;
- flat_dt_blob.size = initial_boot_params->totalsize;
+ flat_dt_blob.size = be32_to_cpu(initial_boot_params->totalsize);

d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
powerpc_debugfs_root, &flat_dt_blob);
--
1.7.1