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[zion] Add a method for duplicating and scoping down VMMOs.

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Use the AHCI section of the PCI config as an example POC of this.

We can now pass a memory capability instead of just the physical
address.
This commit is contained in:
Drew Galbraith 2023-08-01 17:46:26 -07:00
parent 8f84f8c3ca
commit 48c6e5b3a4
12 changed files with 62 additions and 18 deletions
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7
sys/yellowstone/hw/pcie.cpp
View file

@ -27,8 +27,11 @@ PciReader::PciReader() {
header_ = PciHeader(vaddr, 0, 0, 0);
}
uint64_t PciReader::GetAhciPhysical() {
return phys_mem_offset_ + achi_device_offset_;
z_cap_t PciReader::GetAhciVmmo() {
uint64_t new_cap;
check(ZMemoryObjectDuplicate(gBootPciVmmoCap, achi_device_offset_,
kPcieConfigurationSize, &new_cap));
return new_cap;
}
void PciReader::FunctionDump(uint64_t base, uint64_t bus, uint64_t dev,

10
sys/yellowstone/hw/pcie.h
View file

@ -1,6 +1,7 @@
#pragma once
#include <stdint.h>
#include <ztypes.h>
struct PciDeviceHeader {
uint16_t vendor_id;
@ -17,16 +18,19 @@ struct PciDeviceHeader {
uint8_t bist;
} __attribute__((packed));
// TODO: Figure out if it safe to hardcode this.
// For the memory mapped access to PCI, it may be true that
// each configuration item is always the size of a single page.
const uint64_t kPcieConfigurationSize = 0x1000;
class PciReader {
public:
PciReader();
uint64_t GetAhciPhysical();
z_cap_t GetAhciVmmo();
private:
PciDeviceHeader* header_;
// FIXME: Don't hardcode this (It is available from ACPI).
uint64_t phys_mem_offset_ = 0xB000'0000;
uint64_t achi_device_offset_ = 0;