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Kernel: Add typed_map<T>(PhysicalAddress) and use it in ACPI parsing

Browse source 
There was a frequently occurring pattern of "map this physical address
into kernel VM, then read from it, then unmap it again".

This new typed_map() encapsulates that logic by giving you back a
typed pointer to the kind of structure you're interested in accessing.

It returns a TypedMapping<T> that can be used mostly like a pointer.
When destroyed, the TypedMapping object will unmap the memory. :^)
This commit is contained in:
Andreas Kling 2020-04-09 17:12:58 +02:00
parent 4644217094
commit f614f0e2cb
Notes: sideshowbarker 2024-07-19 07:46:44 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/f614f0e2cb6
5 changed files with 140 additions and 98 deletions
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162
Kernel/ACPI/ACPIStaticParser.cpp
View file

@ -28,6 +28,7 @@
#include <Kernel/ACPI/ACPIStaticParser.h>
#include <Kernel/PCI/Access.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/TypedMapping.h>
#include <LibBareMetal/IO.h>
#include <LibBareMetal/StdLib.h>
@ -50,8 +51,7 @@ PhysicalAddress StaticParser::find_table(const char* sig)
dbg() << "ACPI: Calling Find Table method!";
#endif
for (auto p_sdt : m_sdt_pointers) {
auto region = MM.allocate_kernel_region(p_sdt.page_base(), (PAGE_SIZE * 2), "ACPI Static Parser Tables Finding", Region::Access::Read);
auto* sdt = (const Structures::SDTHeader*)region->vaddr().offset(p_sdt.offset_in_page()).as_ptr();
auto sdt = map_typed<Structures::SDTHeader>(p_sdt);
#ifdef ACPI_DEBUG
dbg() << "ACPI: Examining Table @ P " << p_sdt;
#endif
@ -87,8 +87,8 @@ void StaticParser::init_fadt()
m_fadt = find_table("FACP");
ASSERT(!m_fadt.is_null());
auto checkup_region = MM.allocate_kernel_region(m_fadt.page_base(), (PAGE_SIZE * 2), "ACPI Static Parser", Region::Access::Read);
auto* sdt = (const Structures::FADT*)checkup_region->vaddr().offset(m_fadt.offset_in_page()).as_ptr();
auto sdt = map_typed<Structures::FADT>(m_fadt);
#ifdef ACPI_DEBUG
dbg() << "ACPI: FADT @ V " << sdt << ", P " << (void*)m_fadt.as_ptr();
#endif
@ -126,8 +126,7 @@ void StaticParser::init_fadt()
bool StaticParser::can_reboot()
{
auto region = MM.allocate_kernel_region(m_fadt.page_base(), (PAGE_SIZE * 2), "ACPI Static Parser", Region::Access::Read);
auto* fadt = (const Structures::FADT*)region->vaddr().offset(m_fadt.offset_in_page()).as_ptr();
auto fadt = map_typed<Structures::FADT>(m_fadt);
if (fadt->h.revision < 2)
return false;
return m_hardware_flags.reset_register_supported;
@ -135,8 +134,8 @@ bool StaticParser::can_reboot()
void StaticParser::access_generic_address(const Structures::GenericAddressStructure& structure, u32 value)
{
switch (structure.address_space) {
case (u8)GenericAddressStructure::AddressSpace::SystemIO: {
switch ((GenericAddressStructure::AddressSpace)structure.address_space) {
case GenericAddressStructure::AddressSpace::SystemIO: {
IOAddress address(structure.address);
dbg() << "ACPI: Sending value 0x" << String::format("%x", value) << " to " << address;
switch (structure.access_size) {
@ -159,29 +158,20 @@ void StaticParser::access_generic_address(const Structures::GenericAddressStruct
}
return;
}
case (u8)GenericAddressStructure::AddressSpace::SystemMemory: {
auto p_reg = PhysicalAddress(structure.address);
auto p_region = MM.allocate_kernel_region(p_reg.page_base(), (PAGE_SIZE * 2), "ACPI Static Parser", Region::Access::Read);
dbg() << "ACPI: Sending value 0x" << String::format("%x", value) << " to " << p_reg;
switch (structure.access_size) {
case (u8)GenericAddressStructure::AccessSize::Byte: {
auto* reg = (volatile u8*)p_region->vaddr().offset(p_reg.offset_in_page()).as_ptr();
(*reg) = value;
case GenericAddressStructure::AddressSpace::SystemMemory: {
dbg() << "ACPI: Sending value 0x" << String::format("%x", value) << " to " << PhysicalAddress(structure.address);
switch ((GenericAddressStructure::AccessSize)structure.access_size) {
case GenericAddressStructure::AccessSize::Byte:
*map_typed<u8>(PhysicalAddress(structure.address)) = value;
break;
}
case (u8)GenericAddressStructure::AccessSize::Word: {
auto* reg = (volatile u16*)p_region->vaddr().offset(p_reg.offset_in_page()).as_ptr();
(*reg) = value;
case GenericAddressStructure::AccessSize::Word:
*map_typed<u16>(PhysicalAddress(structure.address)) = value;
break;
}
case (u8)GenericAddressStructure::AccessSize::DWord: {
auto* reg = (volatile u32*)p_region->vaddr().offset(p_reg.offset_in_page()).as_ptr();
(*reg) = value;
case GenericAddressStructure::AccessSize::DWord:
*map_typed<u32>(PhysicalAddress(structure.address)) = value;
break;
}
case (u8)GenericAddressStructure::AccessSize::QWord: {
auto* reg = (volatile u64*)p_region->vaddr().offset(p_reg.offset_in_page()).as_ptr();
(*reg) = value;
case GenericAddressStructure::AccessSize::QWord: {
*map_typed<u64>(PhysicalAddress(structure.address)) = value;
break;
}
default:
@ -189,7 +179,7 @@ void StaticParser::access_generic_address(const Structures::GenericAddressStruct
}
return;
}
case (u8)GenericAddressStructure::AddressSpace::PCIConfigurationSpace: {
case GenericAddressStructure::AddressSpace::PCIConfigurationSpace: {
// According to the ACPI specification 6.2, page 168, PCI addresses must be confined to devices on Segment group 0, bus 0.
auto pci_address = PCI::Address(0, 0, ((structure.address >> 24) & 0xFF), ((structure.address >> 16) & 0xFF));
dbg() << "ACPI: Sending value 0x" << String::format("%x", value) << " to " << pci_address;
@ -211,8 +201,7 @@ void StaticParser::access_generic_address(const Structures::GenericAddressStruct
bool StaticParser::validate_reset_register()
{
// According to the ACPI spec 6.2, page 152, The reset register can only be located in I/O bus, PCI bus or memory-mapped.
auto region = MM.allocate_kernel_region(m_fadt.page_base(), (PAGE_SIZE * 2), "ACPI Static Parser", Region::Access::Read);
auto* fadt = (const Structures::FADT*)region->vaddr().offset(m_fadt.offset_in_page()).as_ptr();
auto fadt = map_typed<Structures::FADT>(m_fadt);
return (fadt->reset_reg.address_space == (u8)GenericAddressStructure::AddressSpace::PCIConfigurationSpace || fadt->reset_reg.address_space == (u8)GenericAddressStructure::AddressSpace::SystemMemory || fadt->reset_reg.address_space == (u8)GenericAddressStructure::AddressSpace::SystemIO);
}
@ -227,12 +216,10 @@ void StaticParser::try_acpi_reboot()
dbg() << "ACPI: Rebooting, Probing FADT (" << m_fadt << ")";
#endif
auto region = MM.allocate_kernel_region(m_fadt.page_base(), (PAGE_SIZE * 2), "ACPI Static Parser", Region::Access::Read);
auto* fadt = (const Structures::FADT*)region->vaddr().offset(m_fadt.offset_in_page()).as_ptr();
auto fadt = map_typed<Structures::FADT>(m_fadt);
ASSERT(validate_reset_register());
access_generic_address(fadt->reset_reg, fadt->reset_value);
for (;;)
;
hang();
}
void StaticParser::try_acpi_shutdown()
@ -246,9 +233,7 @@ size_t StaticParser::get_table_size(PhysicalAddress table_header)
#ifdef ACPI_DEBUG
dbg() << "ACPI: Checking SDT Length";
#endif
auto region = MM.allocate_kernel_region(table_header.page_base(), (PAGE_SIZE * 2), "ACPI get_table_size()", Region::Access::Read);
auto* sdt = (volatile Structures::SDTHeader*)region->vaddr().offset(table_header.offset_in_page()).as_ptr();
return sdt->length;
return map_typed<Structures::SDTHeader>(table_header)->length;
}
u8 StaticParser::get_table_revision(PhysicalAddress table_header)
@ -257,9 +242,7 @@ u8 StaticParser::get_table_revision(PhysicalAddress table_header)
#ifdef ACPI_DEBUG
dbg() << "ACPI: Checking SDT Revision";
#endif
auto region = MM.allocate_kernel_region(table_header.page_base(), (PAGE_SIZE * 2), "ACPI get_table_revision()", Region::Access::Read);
auto* sdt = (volatile Structures::SDTHeader*)region->vaddr().offset(table_header.offset_in_page()).as_ptr();
return sdt->revision;
return map_typed<Structures::SDTHeader>(table_header)->revision;
}
void StaticParser::initialize_main_system_description_table()
@ -271,12 +254,12 @@ void StaticParser::initialize_main_system_description_table()
auto length = get_table_size(m_main_system_description_table);
auto revision = get_table_revision(m_main_system_description_table);
auto main_sdt_region = MM.allocate_kernel_region(m_main_system_description_table.page_base(), PAGE_ROUND_UP(length) + PAGE_SIZE, "ACPI Static Parser Initialization", Region::Access::Read, false, true);
auto* sdt = (volatile Structures::SDTHeader*)main_sdt_region->vaddr().offset(m_main_system_description_table.offset_in_page()).as_ptr();
klog() << "ACPI: Main Description Table valid? " << StaticParsing::validate_table(const_cast<Structures::SDTHeader&>(*sdt), length);
auto sdt = map_typed<Structures::SDTHeader>(m_main_system_description_table, length);
klog() << "ACPI: Main Description Table valid? " << StaticParsing::validate_table(*sdt, length);
if (m_xsdt_supported) {
volatile auto* xsdt = (volatile Structures::XSDT*)sdt;
auto& xsdt = (const Structures::XSDT&)*sdt;
klog() << "ACPI: Using XSDT, Enumerating tables @ " << m_main_system_description_table;
klog() << "ACPI: XSDT Revision " << revision << ", Total length - " << length;
#ifdef ACPI_DEBUG
@ -284,12 +267,12 @@ void StaticParser::initialize_main_system_description_table()
#endif
for (u32 i = 0; i < ((length - sizeof(Structures::SDTHeader)) / sizeof(u64)); i++) {
#ifdef ACPI_DEBUG
dbg() << "ACPI: Found new table [" << i << "], @ V 0x" << String::format("%x", &xsdt->table_ptrs[i]) << " - P 0x" << String::format("%x", xsdt->table_ptrs[i]);
dbg() << "ACPI: Found new table [" << i << "], @ V 0x" << String::format("%x", &xsdt.table_ptrs[i]) << " - P 0x" << String::format("%x", xsdt.table_ptrs[i]);
#endif
m_sdt_pointers.append(PhysicalAddress(xsdt->table_ptrs[i]));
m_sdt_pointers.append(PhysicalAddress(xsdt.table_ptrs[i]));
}
} else {
volatile auto* rsdt = (volatile Structures::RSDT*)sdt;
auto& rsdt = (const Structures::RSDT&)*sdt;
klog() << "ACPI: Using RSDT, Enumerating tables @ " << m_main_system_description_table;
klog() << "ACPI: RSDT Revision " << revision << ", Total length - " << length;
#ifdef ACPI_DEBUG
@ -297,17 +280,16 @@ void StaticParser::initialize_main_system_description_table()
#endif
for (u32 i = 0; i < ((length - sizeof(Structures::SDTHeader)) / sizeof(u32)); i++) {
#ifdef ACPI_DEBUG
dbg() << "ACPI: Found new table [" << i << "], @ V 0x" << String::format("%x", &rsdt->table_ptrs[i]) << " - P 0x" << String::format("%x", rsdt->table_ptrs[i]);
dbg() << "ACPI: Found new table [" << i << "], @ V 0x" << String::format("%x", &rsdt.table_ptrs[i]) << " - P 0x" << String::format("%x", rsdt.table_ptrs[i]);
#endif
m_sdt_pointers.append(PhysicalAddress(rsdt->table_ptrs[i]));
m_sdt_pointers.append(PhysicalAddress(rsdt.table_ptrs[i]));
}
}
}
void StaticParser::locate_main_system_description_table()
{
auto rsdp_region = MM.allocate_kernel_region(m_rsdp.page_base(), (PAGE_SIZE * 2), "ACPI Static Parser Initialization", Region::Access::Read, false, true);
volatile auto* rsdp = (Structures::RSDPDescriptor20*)rsdp_region->vaddr().offset(m_rsdp.offset_in_page()).as_ptr();
auto rsdp = map_typed<Structures::RSDPDescriptor20>(m_rsdp);
if (rsdp->base.revision == 0) {
m_xsdt_supported = false;
} else if (rsdp->base.revision >= 2) {
@ -331,7 +313,7 @@ StaticParser::StaticParser(PhysicalAddress rsdp)
locate_static_data();
}
PhysicalAddress StaticParsing::search_rsdp_in_ebda(u16 ebda_segment)
static PhysicalAddress find_rsdp_in_ebda(u16 ebda_segment)
{
auto rsdp_region = MM.allocate_kernel_region(PhysicalAddress(page_base_of((u32)(ebda_segment << 4))), PAGE_ROUND_UP(1024), "ACPI Static Parser RSDP Finding #1", Region::Access::Read, false, true);
char* p_rsdp_str = (char*)(PhysicalAddress(ebda_segment << 4).as_ptr());
@ -346,7 +328,7 @@ PhysicalAddress StaticParsing::search_rsdp_in_ebda(u16 ebda_segment)
return {};
}
PhysicalAddress StaticParsing::search_rsdp_in_bios_area()
static PhysicalAddress find_rsdp_in_bios_area()
{
auto rsdp_region = MM.allocate_kernel_region(PhysicalAddress(0xE0000), PAGE_ROUND_UP(0xFFFFF - 0xE0000), "ACPI Static Parser RSDP Finding #2", Region::Access::Read, false, true);
char* p_rsdp_str = (char*)(PhysicalAddress(0xE0000).as_ptr());
@ -361,10 +343,10 @@ PhysicalAddress StaticParsing::search_rsdp_in_bios_area()
return {};
}
inline bool StaticParsing::validate_table(Structures::SDTHeader& v_header, size_t length)
inline bool StaticParsing::validate_table(const Structures::SDTHeader& v_header, size_t length)
{
u8 checksum = 0;
auto* sdt = (u8*)&v_header;
auto* sdt = (const u8*)&v_header;
for (size_t i = 0; i < length; i++)
checksum += sdt[i];
if (checksum == 0)
@ -372,49 +354,46 @@ inline bool StaticParsing::validate_table(Structures::SDTHeader& v_header, size_
return false;
}
PhysicalAddress StaticParsing::search_rsdp()
PhysicalAddress StaticParsing::find_rsdp()
{
PhysicalAddress rsdp;
auto region = MM.allocate_kernel_region(PhysicalAddress(0), PAGE_SIZE, "ACPI RSDP Searching", Region::Access::Read);
u16 ebda_seg = (u16) * ((uint16_t*)((region->vaddr().get() & PAGE_MASK) + 0x40e));
klog() << "ACPI: Probing EBDA, Segment 0x" << String::format("%x", ebda_seg);
rsdp = search_rsdp_in_ebda(ebda_seg);
auto ebda_seg_ptr = map_typed<u16>(PhysicalAddress(0x40e));
klog() << "ACPI: Probing EBDA, Segment 0x" << String::format("%x", *ebda_seg_ptr);
auto rsdp = find_rsdp_in_ebda(*ebda_seg_ptr);
if (!rsdp.is_null())
return rsdp;
return search_rsdp_in_bios_area();
return find_rsdp_in_bios_area();
}
PhysicalAddress StaticParsing::search_table(PhysicalAddress rsdp, const char* signature)
PhysicalAddress StaticParsing::search_table(PhysicalAddress rsdp_address, const char* signature)
{
// FIXME: There's no validation of ACPI tables here. Use the checksum to validate the tables.
// FIXME: Don't blindly use PAGE_SIZE here, but probe the actual length.
ASSERT(strlen(signature) == 4);
auto rsdp_region = MM.allocate_kernel_region(rsdp.page_base(), (PAGE_SIZE * 2), "ACPI Static Parsing search_table()", Region::Access::Read, false, true);
volatile auto* rsdp_ptr = (Structures::RSDPDescriptor20*)rsdp_region->vaddr().offset(rsdp.offset_in_page()).as_ptr();
if (rsdp_ptr->base.revision == 0) {
return search_table_in_rsdt(PhysicalAddress(rsdp_ptr->base.rsdt_ptr), signature);
}
if (rsdp_ptr->base.revision >= 2) {
if (rsdp_ptr->xsdt_ptr != (u64) nullptr)
return search_table_in_xsdt(PhysicalAddress(rsdp_ptr->xsdt_ptr), signature);
return search_table_in_rsdt(PhysicalAddress(rsdp_ptr->base.rsdt_ptr), signature);
auto rsdp = map_typed<Structures::RSDPDescriptor20>(rsdp_address);
if (rsdp->base.revision == 0)
return search_table_in_rsdt(PhysicalAddress(rsdp->base.rsdt_ptr), signature);
if (rsdp->base.revision >= 2) {
if (rsdp->xsdt_ptr)
return search_table_in_xsdt(PhysicalAddress(rsdp->xsdt_ptr), signature);
return search_table_in_rsdt(PhysicalAddress(rsdp->base.rsdt_ptr), signature);
}
ASSERT_NOT_REACHED();
}
PhysicalAddress StaticParsing::search_table_in_xsdt(PhysicalAddress xsdt, const char* signature)
PhysicalAddress StaticParsing::search_table_in_xsdt(PhysicalAddress xsdt_address, const char* signature)
{
// FIXME: There's no validation of ACPI tables here. Use the checksum to validate the tables.
// FIXME: Don't blindly use PAGE_SIZE here, but probe the actual length.
ASSERT(strlen(signature) == 4);
auto main_sdt_region = MM.allocate_kernel_region(xsdt.page_base(), PAGE_SIZE, "ACPI Static Parsing search_table_in_xsdt()", Region::Access::Read, false, true);
auto* xsdt_ptr = (volatile Structures::XSDT*)main_sdt_region->vaddr().offset(xsdt.offset_in_page()).as_ptr();
for (u32 i = 0; i < ((xsdt_ptr->h.length - sizeof(Structures::SDTHeader)) / sizeof(u64)); i++) {
if (match_table_signature(PhysicalAddress((FlatPtr)xsdt_ptr->table_ptrs[i]), signature))
return PhysicalAddress((FlatPtr)xsdt_ptr->table_ptrs[i]);
auto xsdt = map_typed<Structures::XSDT>(xsdt_address);
for (size_t i = 0; i < ((xsdt->h.length - sizeof(Structures::SDTHeader)) / sizeof(u64)); ++i) {
if (match_table_signature(PhysicalAddress((FlatPtr)xsdt->table_ptrs[i]), signature))
return PhysicalAddress((FlatPtr)xsdt->table_ptrs[i]);
}
return {};
}
@ -423,27 +402,26 @@ bool StaticParsing::match_table_signature(PhysicalAddress table_header, const ch
{
// FIXME: There's no validation of ACPI tables here. Use the checksum to validate the tables.
// FIXME: Don't blindly use PAGE_SIZE here, but probe the actual length.
ASSERT(strlen(signature) == 4);
auto main_sdt_region = MM.allocate_kernel_region(table_header.page_base(), PAGE_SIZE, "ACPI Static Parsing match_table_signature()", Region::Access::Read, false, true);
auto* table_ptr = (volatile Structures::RSDT*)main_sdt_region->vaddr().offset(table_header.offset_in_page()).as_ptr();
return !strncmp(const_cast<const char*>(table_ptr->h.sig), signature, 4);
auto table = map_typed<Structures::RSDT>(table_header);
return !strncmp(table->h.sig, signature, 4);
}
PhysicalAddress StaticParsing::search_table_in_rsdt(PhysicalAddress rsdt, const char* signature)
PhysicalAddress StaticParsing::search_table_in_rsdt(PhysicalAddress rsdt_address, const char* signature)
{
// FIXME: There's no validation of ACPI tables here. Use the checksum to validate the tables.
// FIXME: Don't blindly use PAGE_SIZE here, but probe the actual length.
ASSERT(strlen(signature) == 4);
auto main_sdt_region = MM.allocate_kernel_region(rsdt.page_base(), PAGE_SIZE, "ACPI Static Parsing search_table_in_rsdt()", Region::Access::Read, false, true);
auto* rsdt_ptr = (volatile Structures::RSDT*)main_sdt_region->vaddr().offset(rsdt.offset_in_page()).as_ptr();
auto rsdt = map_typed<Structures::RSDT>(rsdt_address);
for (u32 i = 0; i < ((rsdt_ptr->h.length - sizeof(Structures::SDTHeader)) / sizeof(u32)); i++) {
if (match_table_signature(PhysicalAddress((FlatPtr)rsdt_ptr->table_ptrs[i]), signature))
return PhysicalAddress((FlatPtr)rsdt_ptr->table_ptrs[i]);
for (u32 i = 0; i < ((rsdt->h.length - sizeof(Structures::SDTHeader)) / sizeof(u32)); i++) {
if (match_table_signature(PhysicalAddress((FlatPtr)rsdt->table_ptrs[i]), signature))
return PhysicalAddress((FlatPtr)rsdt->table_ptrs[i]);
}
return {};
}
}
}

6
Kernel/ACPI/Definitions.h
View file

@ -336,14 +336,12 @@ class DynamicParser;
class Parser;
namespace StaticParsing {
PhysicalAddress search_rsdp_in_ebda(u16 ebda_segment);
PhysicalAddress search_rsdp_in_bios_area();
PhysicalAddress search_rsdp();
PhysicalAddress find_rsdp();
bool match_table_signature(PhysicalAddress table_header, const char*);
PhysicalAddress search_table(PhysicalAddress rsdp, const char*);
PhysicalAddress search_table_in_xsdt(PhysicalAddress xsdt, const char*);
PhysicalAddress search_table_in_rsdt(PhysicalAddress rsdt, const char*);
inline bool validate_table(Structures::SDTHeader&, size_t length);
bool validate_table(const Structures::SDTHeader&, size_t length);
};
}
}

2
Kernel/ACPI/Initialize.cpp
View file

@ -53,7 +53,7 @@ void initialize()
if (feature_level == FeatureLevel::Disabled)
return;
auto rsdp = StaticParsing::search_rsdp();
auto rsdp = StaticParsing::find_rsdp();
if (rsdp.is_null())
return;

2
Kernel/Interrupts/InterruptManagement.cpp
View file

@ -127,7 +127,7 @@ RefPtr<IRQController> InterruptManagement::get_responsible_irq_controller(u8 int
PhysicalAddress InterruptManagement::search_for_madt()
{
dbg() << "Early access to ACPI tables for interrupt setup";
auto rsdp = ACPI::StaticParsing::search_rsdp();
auto rsdp = ACPI::StaticParsing::find_rsdp();
if (rsdp.is_null())
return {};
return ACPI::StaticParsing::search_table(rsdp, "APIC");

66
Kernel/VM/TypedMapping.h Normal file
View file

@ -0,0 +1,66 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/StringView.h>
#include <Kernel/VM/MemoryManager.h>
namespace Kernel {
template<typename T>
struct TypedMapping {
const T* ptr() const { return reinterpret_cast<const T*>(region->vaddr().offset(offset).as_ptr()); }
T* ptr() { return reinterpret_cast<T*>(region->vaddr().offset(offset).as_ptr()); }
const T* operator->() const { return ptr(); }
const T& operator*() const { return *ptr(); }
T& operator*() { return *ptr(); }
OwnPtr<Region> region;
size_t offset { 0 };
};
template<typename T>
static TypedMapping<T> map_typed(PhysicalAddress paddr, size_t length, u8 access = Region::Access::Read)
{
TypedMapping<T> table;
table.region = MM.allocate_kernel_region(paddr.page_base(), PAGE_ROUND_UP(length), {}, access);
table.offset = paddr.offset_in_page();
return table;
}
template<typename T>
static TypedMapping<T> map_typed(PhysicalAddress paddr)
{
return map_typed<T>(paddr, sizeof(T));
}
template<typename T>
static TypedMapping<T> map_typed_writable(PhysicalAddress paddr)
{
return map_typed<T>(paddr, sizeof(T), Region::Access::Read | Region::Access::Write);
}
}