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Simplify task switches

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No longer using the rsp from the entry to the kernel, but instead
switching rsp at task-switching time in assembly.

This currently breaks fork()
This commit is contained in:
Justin C. Miller
2019-03-31 22:49:24 -07:00
parent 5cdbedd4d1
commit ca2362f858
21 changed files with 311 additions and 178 deletions
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14
src/kernel/scheduler.h
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@@ -10,7 +10,9 @@ class lapic;
struct page_table;
struct cpu_state;
extern "C" uintptr_t isr_handler(uintptr_t, cpu_state*);
extern "C" void isr_handler(cpu_state*);
extern "C" void task_switch(process *next);
extern "C" void task_fork(process *child);
/// The task scheduler
@@ -46,9 +48,7 @@ public:
void start();
/// Run the scheduler, possibly switching to a new task
/// \arg rsp0 The stack pointer of the current interrupt handler
/// \returns The stack pointer to switch to
uintptr_t schedule(uintptr_t rsp0);
void schedule();
/// Get the current process.
/// \returns A pointer to the current process' process struct
@@ -65,7 +65,7 @@ public:
private:
friend uintptr_t syscall_dispatch(uintptr_t, cpu_state &);
friend uintptr_t isr_handler(uintptr_t, cpu_state*);
friend void isr_handler(cpu_state*);
friend class process;
/// Create a new process object. This process will have its pid
@@ -75,9 +75,7 @@ private:
process_node * create_process(pid_t pid = 0);
/// Handle a timer tick
/// \arg rsp0 The stack pointer of the current interrupt handler
/// \returns The stack pointer to switch to
uintptr_t tick(uintptr_t rsp0);
void tick();
void prune(uint64_t now);