[PATCH qemu v7 1/5] ppc/spapr: Move GPRs setup to one place

[Alexey Kardashevskiy <aik@ozlabs.ru>]

At the moment "pseries" starts in SLOF which only expects the FDT blob
pointer in r3. As we are going to introduce a OpenFirmware support in
QEMU, we will be booting OF clients directly and these expect a stack
pointer in r1, Linux looks at r3/r4 for the initramdisk location
(although vmlinux can find this from the device tree but zImage from
distro kernels cannot).

This extends spapr_cpu_set_entry_state() to take more registers. This
should cause no behavioral change.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
Changes:
v7:
* removed r5 as it points to prom entry which is now provided by
a new firmware in later patches
---
 include/hw/ppc/spapr_cpu_core.h | 4 +++-
 hw/ppc/spapr.c                  | 2 +-
 hw/ppc/spapr_cpu_core.c         | 6 +++++-
 hw/ppc/spapr_rtas.c             | 2 +-
 4 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/include/hw/ppc/spapr_cpu_core.h b/include/hw/ppc/spapr_cpu_core.h
index 1c4cc6559c52..7aed8f555b4f 100644
--- a/include/hw/ppc/spapr_cpu_core.h
+++ b/include/hw/ppc/spapr_cpu_core.h
@@ -40,7 +40,9 @@ typedef struct SpaprCpuCoreClass {
 } SpaprCpuCoreClass;
 
 const char *spapr_get_cpu_core_type(const char *cpu_type);
-void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip, target_ulong r3);
+void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip,
+                               target_ulong r1, target_ulong r3,
+                               target_ulong r4);
 
 typedef struct SpaprCpuState {
     uint64_t vpa_addr;
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 828e2cc1359a..90b68e2f479e 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1691,7 +1691,7 @@ static void spapr_machine_reset(MachineState *machine)
     spapr->fdt_blob = fdt;
 
     /* Set up the entry state */
-    spapr_cpu_set_entry_state(first_ppc_cpu, SPAPR_ENTRY_POINT, fdt_addr);
+    spapr_cpu_set_entry_state(first_ppc_cpu, SPAPR_ENTRY_POINT, 0, fdt_addr, 0);
     first_ppc_cpu->env.gpr[5] = 0;
 
     spapr->cas_reboot = false;
diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index d09125d9afd4..590bd70e05cc 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -84,13 +84,17 @@ static void spapr_reset_vcpu(PowerPCCPU *cpu)
     spapr_irq_cpu_intc_reset(spapr, cpu);
 }
 
-void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip, target_ulong r3)
+void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip,
+                               target_ulong r1, target_ulong r3,
+                               target_ulong r4)
 {
     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
     CPUPPCState *env = &cpu->env;
 
     env->nip = nip;
+    env->gpr[1] = r1;
     env->gpr[3] = r3;
+    env->gpr[4] = r4;
     kvmppc_set_reg_ppc_online(cpu, 1);
     CPU(cpu)->halted = 0;
     /* Enable Power-saving mode Exit Cause exceptions */
diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
index 656fdd221665..fe83b50c6629 100644
--- a/hw/ppc/spapr_rtas.c
+++ b/hw/ppc/spapr_rtas.c
@@ -190,7 +190,7 @@ static void rtas_start_cpu(PowerPCCPU *callcpu, SpaprMachineState *spapr,
      */
     newcpu->env.tb_env->tb_offset = callcpu->env.tb_env->tb_offset;
 
-    spapr_cpu_set_entry_state(newcpu, start, r3);
+    spapr_cpu_set_entry_state(newcpu, start, 0, r3, 0);
 
     qemu_cpu_kick(CPU(newcpu));
 
-- 
2.17.1