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kernel: C++ read_once() and write_once() functions

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This commit is contained in:
max 🍓
2023-03-25 20:37:37 +00:00
parent e615b7dec1
commit e1634de1b4
3 changed files with 87 additions and 72 deletions
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8
arch/x86_64/acpi/io_apic.cpp
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@@ -15,14 +15,14 @@ namespace arch::acpi {
uint32_t io_apic::read(uint32_t reg)
{
*(volatile uint32_t *)(io_base) = reg & 0xFF;
return *(volatile uint32_t *)((char *)io_base + 0x10);
write_once(io_base, reg & 0xFF);
return read_once(io_base + 4);
}
void io_apic::write(uint32_t reg, uint32_t val)
{
*(volatile uint32_t *)(io_base) = reg & 0xFF;
*(volatile uint32_t *)((char *)io_base + 0x10) = val;
write_once(io_base, reg & 0xFF);
write_once(io_base + 4, val);
}
kern_status_t io_apic::read_irq(unsigned int index, irq_entry &entry)

7
arch/x86_64/acpi/local_apic.cpp
View File

@@ -1,5 +1,6 @@
#include <arch/acpi/local_apic.hpp>
#include <socks/vm.h>
#include <socks/compiler.h>
#define LAPIC_REG_EOI 0xB0
@@ -10,16 +11,16 @@ namespace arch::acpi {
uint32_t local_apic::read(uint32_t reg)
{
return *(volatile uint32_t *)((char *)base_ + reg);
return read_once(base_ + (reg >> 2));
}
void local_apic::write(uint32_t reg, uint32_t val)
{
*(volatile uint32_t *)((char *)base_ + reg) = val;
write_once(base_ + (reg >> 2), val);
}
void local_apic::ack()
{
*(volatile uint32_t *)((char *)base_ + LAPIC_REG_EOI) = 0;
write(LAPIC_REG_EOI, 0);
}
}

14
include/socks/compiler.h
View File

@@ -4,6 +4,20 @@
#define READ_ONCE(t, p) (*((const volatile t *)&(p)))
#define WRITE_ONCE(t, p, v) *(volatile t *)&(p) = (v)
#ifdef __cplusplus
template <typename T>
T read_once(const volatile T *ptr)
{
return *ptr;
}
template <typename T>
void write_once(volatile T *ptr, T value)
{
*ptr = value;
}
#endif
#undef __used
#define __used __attribute__((used))