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[PATCH v2 43/86] hw/hppa/machine: Map the PDC memory region with higher
From: |
Igor Mammedov |
Subject: |
[PATCH v2 43/86] hw/hppa/machine: Map the PDC memory region with higher priority |
Date: |
Wed, 15 Jan 2020 16:06:58 +0100 |
From: Philippe Mathieu-Daudé <address@hidden>
The region in range [0xf0000000 - 0xf1000000] is the PDC area
(Processor Dependent Code), where the firmware is loaded.
This region has higher priority than the main memory.
When the machine has more than 3840MB of RAM, there is an
overlap. Since the PDC is closer to the CPU in the bus
hierarchy, it gets accessed first, and the CPU does not have
access to the RAM in this range.
To model the same behavior and keep a simple memory layout,
reduce the priority of the RAM region. The PDC region ends
overlapping the RAM.
Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
Reviewed-by: Richard Henderson <address@hidden>
Acked-by: Helge Deller <address@hidden>
Signed-off-by: Igor Mammedov <address@hidden>
---
hw/hppa/machine.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/hppa/machine.c b/hw/hppa/machine.c
index 119ae4d..810e671 100644
--- a/hw/hppa/machine.c
+++ b/hw/hppa/machine.c
@@ -98,7 +98,7 @@ static void machine_hppa_init(MachineState *machine)
ram_region = g_new(MemoryRegion, 1);
memory_region_allocate_system_memory(ram_region, OBJECT(machine),
"ram", ram_size);
- memory_region_add_subregion(addr_space, 0, ram_region);
+ memory_region_add_subregion_overlap(addr_space, 0, ram_region, -1);
/* Init Dino (PCI host bus chip). */
pci_bus = dino_init(addr_space, &rtc_irq, &serial_irq);
--
2.7.4
- [PATCH v2 35/86] arm:xilinx_zynq: use memdev for RAM, (continued)
- [PATCH v2 35/86] arm:xilinx_zynq: use memdev for RAM, Igor Mammedov, 2020/01/15
- [PATCH v2 42/86] hw/hppa/machine: Restrict the total memory size to 3GB, Igor Mammedov, 2020/01/15
- [PATCH v2 39/86] null-machine: use memdev for RAM, Igor Mammedov, 2020/01/15
- [PATCH v2 37/86] arm:xlnx-zcu102: use memdev for RAM, Igor Mammedov, 2020/01/15
- [PATCH v2 40/86] cris:axis_dev88: use memdev for RAM, Igor Mammedov, 2020/01/15
- [PATCH v2 43/86] hw/hppa/machine: Map the PDC memory region with higher priority,
Igor Mammedov <=
- [PATCH v2 45/86] x86:microvm: use memdev for RAM, Igor Mammedov, 2020/01/15
- [PATCH v2 44/86] hppa: use memdev for RAM, Igor Mammedov, 2020/01/15
- [PATCH v2 38/86] s390x:s390-virtio-ccw: use memdev for RAM, Igor Mammedov, 2020/01/15
- [PATCH v2 41/86] hw/hppa/machine: Correctly check the firmware is in PDC range, Igor Mammedov, 2020/01/15