47 lines
1.8 KiB
Markdown
47 lines
1.8 KiB
Markdown
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---
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title: "cpu.h"
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summary: "stuff related directly with the cpu"
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---
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OSDev Wiki: [x86 CPU Registers](https://wiki.osdev.org/CPU_Registers_x86)
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# `cpu_state_T` - struct
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- **cr3** - Control register 3, holds the current page table
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- **rax** - General purpose register
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- **rbx** - General purpose register
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- **rcx** - General purpose register
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- **rdx** - General purpose register
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- **rsi** - General purpose register
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- **rdi** - General purpose register
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- **rbp** - The Bottom of the current stack frame
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- **interrupt_id** - The ID of the interrupt, that captured the cpu state
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- **error_code** - Some exceptions such as the Page fault push more detailed information into here
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- **rip** - The current instruction address
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- **cs** - Segment selector of the associated IDT descriptor
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- **flags** - The CPU's FLAGS register, a status bitmap -> [cpu_flags_E](https://nerdcult.net/projects/noxos/docs/codebase/platform/cpu.h/#cpu_flags_e---enum)
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- **rsp** - The Top of the current stack frame
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- **ss** - Not totally sure, what this does, but it has to do with security rings
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This struct defines a *complete* CPU state, that can be saved and restored.
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Such a state is saved when the CPU fires an interrupt and restored by the interrupt handler when it's finished.
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This allows multithreading and exception analysis.
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# `cpu_flags_E` - enum
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- **CPU_FLAG_CARRY**
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- **CPU_FLAG_PARITY**
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- **CPU_FLAG_AUXILIARY**
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- **CPU_FLAG_ZERO**
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- **CPU_FLAG_SIGN**
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- **CPU_FLAG_TRAP**
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- **CPU_FLAG_INTERRUPT_ENABLE**
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- **CPU_FLAG_DIRECTION**
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- **CPU_FLAG_OVERFLOW**
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- **CPU_FLAG_IO_PRIVILEGE_0**
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- **CPU_FLAG_IO_PRIVILEGE_1**
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- **CPU_FLAG_NESTED_TASK**
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- **CPU_FLAG_RESUME**
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- **CPU_FLAG_VIRTUAL_8086**
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- **CPU_FLAG_ALIGNMENT_CHECK**
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- **CPU_FLAG_VIRTUAL_INTERRUPT**
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- **CPU_FLAG_VIRTUAL_INTERRUPT_PENDING**
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- **CPU_FLAG_CPUID**
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