[PATCH 12/14] powerpc: make iSeries flattened device tree dynamic
Stephen Rothwell
sfr at canb.auug.org.au
Fri May 19 17:04:48 EST 2006
First we capture all the strings from dt.c statically by noting that gcc
puts them in a special section of their own. Idea from Michael Ellerman.
Then we move the flattened device tree to klimit.
Still to come, making the values blob grow as needed.
Signed-off-by: Stephen Rothwell <sfr at canb.auug.org.au>
---
arch/powerpc/kernel/vmlinux.lds.S | 5 ++
arch/powerpc/platforms/iseries/Makefile | 5 +-
arch/powerpc/platforms/iseries/dt.c | 96 ++++++++++++++++++-------------
3 files changed, 66 insertions(+), 40 deletions(-)
--
Cheers,
Stephen Rothwell sfr at canb.auug.org.au
0f75701d8ac409a5e5c9e1de1d414129a435b267
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index fe79c25..8b25953 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -93,6 +93,11 @@ #endif /* CONFIG_PPC32 */
__ptov_table_begin = .;
*(.ptov_fixup);
__ptov_table_end = .;
+#ifdef CONFIG_PPC_ISERIES
+ __dt_strings_start = .;
+ *(.dt_strings);
+ __dt_strings_end = .;
+#endif
}
. = ALIGN(16);
diff --git a/arch/powerpc/platforms/iseries/Makefile b/arch/powerpc/platforms/iseries/Makefile
index 3230621..dee4eb4 100644
--- a/arch/powerpc/platforms/iseries/Makefile
+++ b/arch/powerpc/platforms/iseries/Makefile
@@ -1,8 +1,11 @@
EXTRA_CFLAGS += -mno-minimal-toc
-obj-y += hvlog.o hvlpconfig.o lpardata.o setup.o dt.o mf.o lpevents.o \
+obj-y += hvlog.o hvlpconfig.o lpardata.o setup.o dt_mod.o mf.o lpevents.o \
hvcall.o proc.o htab.o iommu.o misc.o irq.o
obj-$(CONFIG_PCI) += pci.o vpdinfo.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_VIOPATH) += viopath.o
obj-$(CONFIG_MODULES) += ksyms.o
+
+$(obj)/dt_mod.o: $(obj)/dt.o
+ @$(OBJCOPY) --rename-section .rodata.str1.8=.dt_strings $(obj)/dt.o $(obj)/dt_mod.o
diff --git a/arch/powerpc/platforms/iseries/dt.c b/arch/powerpc/platforms/iseries/dt.c
index 93d4233..0371329 100644
--- a/arch/powerpc/platforms/iseries/dt.c
+++ b/arch/powerpc/platforms/iseries/dt.c
@@ -30,6 +30,7 @@ #include <asm/lppaca.h>
#include <asm/page.h>
#include <asm/cputable.h>
#include <asm/abs_addr.h>
+#include <asm/system.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/iseries/hv_call_xm.h>
@@ -47,6 +48,9 @@ #else
#define DBG(fmt...)
#endif
+extern char __dt_strings_start[];
+extern char __dt_strings_end[];
+
struct blob {
unsigned char data[PAGE_SIZE * 2];
unsigned long next;
@@ -55,26 +59,34 @@ struct blob {
struct iseries_flat_dt {
struct boot_param_header header;
u64 reserve_map[2];
- struct blob dt;
- struct blob strings;
+ struct blob *dt;
};
-static struct iseries_flat_dt iseries_dt;
+static struct iseries_flat_dt *iseries_dt;
-static void __init dt_init(struct iseries_flat_dt *dt)
+static struct iseries_flat_dt * __init dt_init(void)
{
+ struct iseries_flat_dt *dt;
+ unsigned long str_len;
+
+ str_len = __dt_strings_end - __dt_strings_start;
+ dt = (struct iseries_flat_dt *)ALIGN(klimit, 8);
dt->header.off_mem_rsvmap =
offsetof(struct iseries_flat_dt, reserve_map);
- dt->header.off_dt_struct = offsetof(struct iseries_flat_dt, dt);
- dt->header.off_dt_strings = offsetof(struct iseries_flat_dt, strings);
- dt->header.totalsize = sizeof(struct iseries_flat_dt);
- dt->header.dt_strings_size = sizeof(struct blob);
+ dt->header.off_dt_strings = ALIGN(sizeof(*dt), 8);
+ dt->header.off_dt_struct = dt->header.off_dt_strings
+ + ALIGN(str_len, 8);
+ dt->dt = (struct blob *)((unsigned long)dt + dt->header.off_dt_struct);
+ klimit = ALIGN((unsigned long)(dt->dt) + sizeof(struct blob), 8);
+ dt->header.totalsize = klimit - (unsigned long)dt;
+ dt->header.dt_strings_size = str_len;
/* There is no notion of hardware cpu id on iSeries */
dt->header.boot_cpuid_phys = smp_processor_id();
- dt->dt.next = (unsigned long)&dt->dt.data;
- dt->strings.next = (unsigned long)&dt->strings.data;
+ dt->dt->next = (unsigned long)&dt->dt->data;
+ memcpy((char *)dt + dt->header.off_dt_strings, __dt_strings_start,
+ str_len);
dt->header.magic = OF_DT_HEADER;
dt->header.version = 0x10;
@@ -82,6 +94,8 @@ static void __init dt_init(struct iserie
dt->reserve_map[0] = 0;
dt->reserve_map[1] = 0;
+
+ return dt;
}
static void __init dt_check_blob(struct blob *b)
@@ -94,19 +108,19 @@ static void __init dt_check_blob(struct
static void __init dt_push_u32(struct iseries_flat_dt *dt, u32 value)
{
- *((u32*)dt->dt.next) = value;
- dt->dt.next += sizeof(u32);
+ *((u32*)dt->dt->next) = value;
+ dt->dt->next += sizeof(u32);
- dt_check_blob(&dt->dt);
+ dt_check_blob(dt->dt);
}
#ifdef notyet
static void __init dt_push_u64(struct iseries_flat_dt *dt, u64 value)
{
- *((u64*)dt->dt.next) = value;
- dt->dt.next += sizeof(u64);
+ *((u64*)dt->dt->next) = value;
+ dt->dt->next += sizeof(u64);
- dt_check_blob(&dt->dt);
+ dt_check_blob(dt->dt);
}
#endif
@@ -125,7 +139,7 @@ static unsigned long __init dt_push_byte
static void __init dt_start_node(struct iseries_flat_dt *dt, char *name)
{
dt_push_u32(dt, OF_DT_BEGIN_NODE);
- dt_push_bytes(&dt->dt, name, strlen(name) + 1);
+ dt_push_bytes(dt->dt, name, strlen(name) + 1);
}
#define dt_end_node(dt) dt_push_u32(dt, OF_DT_END_NODE)
@@ -140,14 +154,13 @@ static void __init dt_prop(struct iserie
/* Length of the data */
dt_push_u32(dt, len);
- /* Put the property name in the string blob. */
- offset = dt_push_bytes(&dt->strings, name, strlen(name) + 1);
+ offset = name - __dt_strings_start;
/* The offset of the properties name in the string blob. */
dt_push_u32(dt, (u32)offset);
/* The actual data. */
- dt_push_bytes(&dt->dt, data, len);
+ dt_push_bytes(dt->dt, data, len);
}
static void __init dt_prop_str(struct iseries_flat_dt *dt, char *name,
@@ -579,40 +592,45 @@ static void __init dt_pci_devices(struct
}
}
+static void dt_finish(struct iseries_flat_dt *dt)
+{
+ dt_push_u32(dt, OF_DT_END);
+}
+
void * __init build_flat_dt(unsigned long phys_mem_size)
{
u64 tmp[2];
- dt_init(&iseries_dt);
+ iseries_dt = dt_init();
- dt_start_node(&iseries_dt, "");
+ dt_start_node(iseries_dt, "");
- dt_prop_u32(&iseries_dt, "#address-cells", 2);
- dt_prop_u32(&iseries_dt, "#size-cells", 2);
- dt_model(&iseries_dt);
+ dt_prop_u32(iseries_dt, "#address-cells", 2);
+ dt_prop_u32(iseries_dt, "#size-cells", 2);
+ dt_model(iseries_dt);
/* /memory */
- dt_start_node(&iseries_dt, "memory at 0");
- dt_prop_str(&iseries_dt, "name", "memory");
- dt_prop_str(&iseries_dt, "device_type", "memory");
+ dt_start_node(iseries_dt, "memory at 0");
+ dt_prop_str(iseries_dt, "name", "memory");
+ dt_prop_str(iseries_dt, "device_type", "memory");
tmp[0] = 0;
tmp[1] = phys_mem_size;
- dt_prop_u64_list(&iseries_dt, "reg", tmp, 2);
- dt_end_node(&iseries_dt);
+ dt_prop_u64_list(iseries_dt, "reg", tmp, 2);
+ dt_end_node(iseries_dt);
/* /chosen */
- dt_start_node(&iseries_dt, "chosen");
- dt_prop_str(&iseries_dt, "bootargs", cmd_line);
- dt_end_node(&iseries_dt);
+ dt_start_node(iseries_dt, "chosen");
+ dt_prop_str(iseries_dt, "bootargs", cmd_line);
+ dt_end_node(iseries_dt);
- dt_cpus(&iseries_dt);
+ dt_cpus(iseries_dt);
- dt_vdevices(&iseries_dt);
- dt_pci_devices(&iseries_dt);
+ dt_vdevices(iseries_dt);
+ dt_pci_devices(iseries_dt);
- dt_end_node(&iseries_dt);
+ dt_end_node(iseries_dt);
- dt_push_u32(&iseries_dt, OF_DT_END);
+ dt_finish(iseries_dt);
- return &iseries_dt;
+ return iseries_dt;
}
--
1.3.1.ge923
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