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Kernel: Implement software context switching and Processor structure

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Moving certain globals into a new Processor structure for
each CPU allows us to eventually run an instance of the
scheduler on each CPU.
This commit is contained in:
Tom 2020-06-27 13:42:28 -06:00 • committed by Andreas Kling
parent 10407061d2
commit fb41d89384
22 changed files with 1002 additions and 513 deletions
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28
Kernel/Syscall.cpp
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@ -33,7 +33,7 @@
namespace Kernel {
extern "C" void syscall_handler(RegisterState&);
extern "C" void syscall_handler(TrapFrame*);
extern "C" void syscall_asm_entry();
asm(
@ -46,22 +46,23 @@ asm(
" pushl %fs\n"
" pushl %gs\n"
" pushl %ss\n"
" mov $0x10, %ax\n"
" mov $" __STRINGIFY(GDT_SELECTOR_DATA0) ", %ax\n"
" mov %ax, %ds\n"
" mov %ax, %es\n"
" mov $" __STRINGIFY(GDT_SELECTOR_PROC) ", %ax\n"
" mov %ax, %fs\n"
" cld\n"
" xor %esi, %esi\n"
" xor %edi, %edi\n"
" push %esp\n"
" call syscall_handler\n"
" add $0x8, %esp\n"
" popl %gs\n"
" popl %fs\n"
" popl %es\n"
" popl %ds\n"
" popa\n"
" add $0x4, %esp\n"
" iret\n");
" pushl %esp \n" // set TrapFrame::regs
" subl $" __STRINGIFY(TRAP_FRAME_SIZE - 4) ", %esp \n"
" movl %esp, %ebx \n"
" pushl %ebx \n" // push pointer to TrapFrame
" call enter_trap_no_irq \n"
" movl %ebx, 0(%esp) \n" // push pointer to TrapFrame
" call syscall_handler \n"
" movl %ebx, 0(%esp) \n" // push pointer to TrapFrame
" jmp common_trap_exit \n");
namespace Syscall {
@ -120,8 +121,9 @@ int handle(RegisterState& regs, u32 function, u32 arg1, u32 arg2, u32 arg3)
}
void syscall_handler(RegisterState& regs)
void syscall_handler(TrapFrame* trap)
{
auto& regs = *trap->regs;
// Special handling of the "gettid" syscall since it's extremely hot.
// FIXME: Remove this hack once userspace locks stop calling it so damn much.
if (regs.eax == SC_gettid) {