| // Copyright 2020 The Fuchsia Authors |
| // |
| // Use of this source code is governed by a MIT-style |
| // license that can be found in the LICENSE file or at |
| // https://opensource.org/licenses/MIT |
| |
| #include <inttypes.h> |
| #include <lib/acpi_lite.h> |
| #include <lib/acpi_lite/zircon.h> |
| #include <zircon/compiler.h> |
| |
| #include <vm/physmap.h> |
| |
| namespace { |
| // AcpiParser requires a ZirconPhysmemReader instance that outlives |
| // it. We share a single global instance for all AcpiParser instances. |
| acpi_lite::ZirconPhysmemReader g_physmem_reader; |
| } // anonymous namespace |
| |
| namespace acpi_lite { |
| |
| zx::result<const void*> ZirconPhysmemReader::PhysToPtr(uintptr_t phys, size_t length) { |
| // We don't support the 0 physical address or 0-length ranges. |
| if (length == 0 || phys == 0) { |
| return zx::error(ZX_ERR_INVALID_ARGS); |
| } |
| |
| // Get the last byte of the specified range, ensuring we don't wrap around the address |
| // space. |
| uintptr_t phys_end; |
| if (add_overflow(phys, length - 1, &phys_end)) { |
| return zx::error(ZX_ERR_OUT_OF_RANGE); |
| } |
| |
| // Ensure that both "phys" and "phys + length - 1" have valid addresses. |
| // |
| // The Zircon physmap is contiguous, so we don't have to worry about intermediate addresses. |
| if (!is_physmap_phys_addr(phys) || !is_physmap_phys_addr(phys_end)) { |
| return zx::error(ZX_ERR_OUT_OF_RANGE); |
| } |
| |
| return zx::success(paddr_to_physmap(phys)); |
| } |
| |
| // Create a new AcpiParser, starting at the given Root System Description Pointer (RSDP). |
| zx::result<AcpiParser> AcpiParserInit(zx_paddr_t rsdp_pa) { |
| return AcpiParser::Init(g_physmem_reader, rsdp_pa); |
| } |
| |
| } // namespace acpi_lite |