63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
#include "syscall/handler.h"
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#include "../arch/core.h"
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#include "../arch/core_interrupt.h"
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#include "../arch/gdt.h"
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#include "../arch/idt.h"
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#include "../debug/kernelpanic.h"
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#include "../debug/output.h"
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#include "../interrupt/guard.h"
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#include "../syscall/skeleton.h"
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#include "../syscall/stub.h"
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#include "types.h"
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/*! \brief Interrupt based system call entry function
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*
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* Low-level function written in assembly (located in `syscall/handler.asm`),
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* calls \ref syscall_handler
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*/
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extern "C" [[gnu::interrupt]] void syscall_entry(InterruptContext *context);
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namespace Syscall {
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/*! \brief High level system call handler
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* called by both low level handler in `syscall/handler.asm`.
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*
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* Processes the request by delegating it to the appropriate function identified
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* by the system call number -- allowing up to five parameters for the system
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* call.
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*
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* \param p1 first parameter
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* \param p2 second parameter
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* \param p3 third parameter
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* \param p4 fourth parameter
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* \param p5 fifth parameter
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* \param sysnum identifier for the system call
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* \param user pointer to the interrupt \ref context (for example to determine
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* instruction pointer)
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* \return system call return value
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*/
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extern "C" size_t syscall_handler(size_t sysnum, size_t p1, size_t p2,
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size_t p3, size_t p4, size_t p5,
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InterruptContext *user) {
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switch ((Syscall::ID)sysnum) {
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case Syscall::ID::TEST:
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Syscall::Skeleton::test(Guard::enter().vault(), p1, p2, p3, p4, p5);
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break;
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case Syscall::ID::WRITE:
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Guarded g = Guard::enter();
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g.vault().kout.setPos((int)p4, (int)p5);
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Syscall::Skeleton::write(g.vault(), p1, (char*)p2, p3);
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break;
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}
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return static_cast<size_t>(-1);
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}
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void init() {
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// Set interrupt based syscall handler
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IDT::set(Core::Interrupt::Vector::SYSCALL, IDT::InterruptDescriptor::Returning(syscall_entry, 0, IDT::DPL_USER));
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IDT::load();
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}
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} // namespace Syscall
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