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aarch64: Update FDT for the new memory layout

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If the RAM is across the hole, 2 `memory` nodes are needed in FDT.

Signed-off-by: Michael Zhao <michael.zhao@arm.com>
This commit is contained in:
Michael Zhao 2022-03-30 17:59:47 +08:00 committed by Xin Wang
parent d60d6713fa
commit 96ed1327f8
1 changed files with 37 additions and 8 deletions
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45
arch/src/aarch64/fdt.rs
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@ -231,6 +231,9 @@ fn create_memory_node(
guest_mem: &GuestMemoryMmap,
numa_nodes: &NumaNodes,
) -> FdtWriterResult<()> {
// See https://github.com/torvalds/linux/blob/master/Documentation/devicetree/booting-without-of.txt#L960
// for an explanation of memory nodes.
if numa_nodes.len() > 1 {
for numa_node_idx in 0..numa_nodes.len() {
let numa_node = numa_nodes.get(&(numa_node_idx as u32));
@ -255,15 +258,41 @@ fn create_memory_node(
}
}
} else {
let mem_size = guest_mem.last_addr().raw_value() - super::layout::RAM_START.raw_value() + 1;
// See https://github.com/torvalds/linux/blob/master/Documentation/devicetree/booting-without-of.txt#L960
// for an explanation of this.
let mem_reg_prop = [super::layout::RAM_START.raw_value() as u64, mem_size as u64];
let memory_node = fdt.begin_node("memory")?;
let last_addr = guest_mem.last_addr().raw_value();
if last_addr < super::layout::MEM_32BIT_RESERVED_START.raw_value() {
// Case 1: all RAM is under the hole
let mem_size = last_addr - super::layout::RAM_START.raw_value() + 1;
let mem_reg_prop = [super::layout::RAM_START.raw_value() as u64, mem_size as u64];
let memory_node = fdt.begin_node("memory")?;
fdt.property_string("device_type", "memory")?;
fdt.property_array_u64("reg", &mem_reg_prop)?;
fdt.end_node(memory_node)?;
} else {
// Case 2: RAM is split by the hole
fdt.property_string("device_type", "memory")?;
fdt.property_array_u64("reg", &mem_reg_prop)?;
fdt.end_node(memory_node)?;
// Region 1: RAM before the hole
let mem_size = super::layout::MEM_32BIT_RESERVED_START.raw_value()
- super::layout::RAM_START.raw_value();
let mem_reg_prop = [super::layout::RAM_START.raw_value() as u64, mem_size as u64];
let memory_node_name = format!("memory@{:x}", super::layout::RAM_START.raw_value());
let memory_node = fdt.begin_node(&memory_node_name)?;
fdt.property_string("device_type", "memory")?;
fdt.property_array_u64("reg", &mem_reg_prop)?;
fdt.end_node(memory_node)?;
// Region 2: RAM after the hole
let mem_size = last_addr - super::layout::RAM_64BIT_START.raw_value() + 1;
let mem_reg_prop = [
super::layout::RAM_64BIT_START.raw_value() as u64,
mem_size as u64,
];
let memory_node_name =
format!("memory@{:x}", super::layout::RAM_64BIT_START.raw_value());
let memory_node = fdt.begin_node(&memory_node_name)?;
fdt.property_string("device_type", "memory")?;
fdt.property_array_u64("reg", &mem_reg_prop)?;
fdt.end_node(memory_node)?;
}
}
Ok(())