[PATCH 6/10] ppc64: Create a fake flat device tree on iSeries
Michael Ellerman
michael at ellerman.id.au
Wed Aug 10 14:18:41 EST 2005
This patch adds infrastructure for creating a fake flattened device tree
on iSeries.
We also need to build prom.o for iSeries which means we'll always need it.
Signed-off-by: Michael Ellerman <michael at ellerman.id.au>
---
arch/ppc64/kernel/iSeries_setup.c | 137 ++++++++++++++++++++++++++++++++++++++
1 files changed, 137 insertions(+)
Index: work/arch/ppc64/kernel/iSeries_setup.c
===================================================================
--- work.orig/arch/ppc64/kernel/iSeries_setup.c
+++ work/arch/ppc64/kernel/iSeries_setup.c
@@ -912,7 +912,144 @@ struct machdep_calls __initdata iseries_
/* XXX Implement enable_pmcs for iSeries */
};
+struct blob {
+ unsigned char data[PAGE_SIZE];
+ unsigned long next;
+};
+
+struct iseries_flat_dt {
+ struct boot_param_header header;
+ u64 reserve_map[2];
+ struct blob dt;
+ struct blob strings;
+};
+
+struct iseries_flat_dt iseries_dt;
+
+void dt_init(struct iseries_flat_dt *dt)
+{
+ 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);
+
+ /* 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->header.magic = OF_DT_HEADER;
+ dt->header.version = 0x10;
+ dt->header.last_comp_version = 0x10;
+
+ dt->reserve_map[0] = 0;
+ dt->reserve_map[1] = 0;
+}
+
+void dt_check_blob(struct blob *b)
+{
+ if (b->next >= (unsigned long)&b->next) {
+ DBG("Ran out of space in flat device tree blob!\n");
+ BUG();
+ }
+}
+
+void dt_push_u32(struct iseries_flat_dt *dt, u32 value)
+{
+ *((u32*)dt->dt.next) = value;
+ dt->dt.next += sizeof(u32);
+
+ dt_check_blob(&dt->dt);
+}
+
+void dt_push_u64(struct iseries_flat_dt *dt, u64 value)
+{
+ *((u64*)dt->dt.next) = value;
+ dt->dt.next += sizeof(u64);
+
+ dt_check_blob(&dt->dt);
+}
+
+unsigned long dt_push_bytes(struct blob *blob, char *data, int len)
+{
+ unsigned long start = blob->next - (unsigned long)blob->data;
+
+ memcpy((char *)blob->next, data, len);
+ blob->next = _ALIGN(blob->next + len, 4);
+
+ dt_check_blob(blob);
+
+ return start;
+}
+
+void 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);
+}
+
+#define dt_end_node(dt) dt_push_u32(dt, OF_DT_END_NODE)
+
+void dt_prop(struct iseries_flat_dt *dt, char *name, char *data, int len)
+{
+ unsigned long offset;
+
+ dt_push_u32(dt, OF_DT_PROP);
+
+ /* 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);
+
+ /* 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);
+}
+
+void dt_prop_str(struct iseries_flat_dt *dt, char *name, char *data)
+{
+ dt_prop(dt, name, data, strlen(data) + 1); /* + 1 for NULL */
+}
+
+void dt_prop_u32(struct iseries_flat_dt *dt, char *name, u32 data)
+{
+ dt_prop(dt, name, (char *)&data, sizeof(u32));
+}
+
+void dt_prop_u64(struct iseries_flat_dt *dt, char *name, u64 data)
+{
+ dt_prop(dt, name, (char *)&data, sizeof(u64));
+}
+
+void dt_prop_u64_list(struct iseries_flat_dt *dt, char *name, u64 *data, int n)
+{
+ dt_prop(dt, name, (char *)data, sizeof(u64) * n);
+}
+
+void dt_prop_empty(struct iseries_flat_dt *dt, char *name)
+{
+ dt_prop(dt, name, NULL, 0);
+}
+
+void build_flat_dt(struct iseries_flat_dt *dt)
+{
+ dt_init(dt);
+
+ dt_start_node(dt, "");
+ dt_end_node(dt);
+
+ dt_push_u32(dt, OF_DT_END);
+}
+
void __init iSeries_early_setup(void)
{
iSeries_fixup_klimit();
+
+ build_flat_dt(&iseries_dt);
}
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