227 lines
6.4 KiB
C
227 lines
6.4 KiB
C
#pragma once
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#include <stdint.h>
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#include <kernel/types.h>
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#include <kernel/vfs.h>
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#include <kernel/tree.h>
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#include <kernel/list.h>
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#include <kernel/spinlock.h>
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#include <kernel/arch/x86_64/pml.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/signal_defs.h>
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#define PROC_REUSE_FDS 0x0001
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#define KERNEL_STACK_SIZE 0x9000
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#define USER_ROOT_UID 0
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typedef struct {
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intptr_t refcount;
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union PML * directory;
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spin_lock_t lock;
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} page_directory_t;
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typedef struct {
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uintptr_t sp; /* 0 */
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uintptr_t bp; /* 8 */
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uintptr_t ip; /* 16 */
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uintptr_t tls_base; /* 24 */
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uintptr_t saved[5]; /* XXX Arch dependent */
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/**
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* 32: rbx
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* 40: r12
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* 48: r13
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* 56: r14
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* 64: r15
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*/
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} kthread_context_t;
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typedef struct thread {
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kthread_context_t context;
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uint8_t fp_regs[512];
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page_directory_t * page_directory;
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} thread_t;
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typedef struct image {
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uintptr_t entry;
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uintptr_t heap;
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uintptr_t stack;
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uintptr_t shm_heap;
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uintptr_t userstack;
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spin_lock_t lock;
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} image_t;
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typedef struct file_descriptors {
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fs_node_t ** entries;
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uint64_t * offsets;
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int * modes;
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size_t length;
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size_t capacity;
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size_t refs;
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spin_lock_t lock;
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} fd_table_t;
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#define PROC_FLAG_IS_TASKLET 0x01
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#define PROC_FLAG_FINISHED 0x02
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#define PROC_FLAG_STARTED 0x04
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#define PROC_FLAG_RUNNING 0x08
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#define PROC_FLAG_SLEEP_INT 0x10
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#define PROC_FLAG_SUSPENDED 0x20
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typedef struct process {
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pid_t id; /* PID */
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pid_t group; /* thread group */
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pid_t job; /* tty job */
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pid_t session; /* tty session */
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int status; /* status code */
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unsigned int flags; /* finished, started, running, isTasklet */
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int owner;
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uid_t user;
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uid_t real_user;
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unsigned int mask;
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char * name;
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char * description;
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char ** cmdline;
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char * wd_name;
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fs_node_t * wd_node;
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fd_table_t * fds; /* File descriptor table */
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tree_node_t * tree_entry;
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struct regs * syscall_registers;
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struct regs * interrupt_registers;
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list_t * wait_queue;
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list_t * shm_mappings;
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list_t * node_waits;
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list_t * signal_queue;
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char * signal_kstack;
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node_t sched_node;
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node_t sleep_node;
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node_t * timed_sleep_node;
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node_t * timeout_node;
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struct timeval start;
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int awoken_index;
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thread_t thread;
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thread_t signal_state;
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image_t image;
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spin_lock_t sched_lock;
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uintptr_t signals[NUMSIGNALS+1];
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} process_t;
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typedef struct {
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uint64_t end_tick;
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uint64_t end_subtick;
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process_t * process;
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int is_fswait;
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} sleeper_t;
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struct ProcessorLocal {
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/**
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* @brief The running process on this core.
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*
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* The current_process is a pointer to the process struct for
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* the process, userspace-thread, or kernel tasklet currently
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* executing. Once the scheduler is active, this should always
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* be set. If a core is not currently doing, its current_process
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* should be the core's idle task.
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*
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* Because a process's data can be modified by nested interrupt
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* contexts, we mark them as volatile to avoid making assumptions
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* based on register-stored cached values.
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*/
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volatile process_t * current_process;
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/**
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* @brief Idle loop.
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*
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* This is a special kernel tasklet that sits in a loop
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* waiting for an interrupt from a preemption source or hardware
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* device. Its context should never be saved, it should never
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* be added to a sleep queue, and it should be scheduled whenever
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* there is nothing else to do.
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*/
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process_t * kernel_idle_task;
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/**
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* @brief Process this core was last scheduled to run.
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*/
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volatile process_t * previous_process;
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int cpu_id;
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union PML * current_pml;
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struct regs * interrupt_registers;
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#ifdef __x86_64__
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int lapic_id;
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/* Processor information loaded at startup. */
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int cpu_model;
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int cpu_family;
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char cpu_model_name[48];
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const char * cpu_manufacturer;
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#endif
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};
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extern struct ProcessorLocal processor_local_data[32];
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extern int processor_count;
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/**
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* @brief Core-local kernel data.
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*
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* x86-64: Marking this as __seg_gs makes it %gs-base-relative.
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*/
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static struct ProcessorLocal __seg_gs * const this_core = 0;
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extern unsigned long process_append_fd(process_t * proc, fs_node_t * node);
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extern long process_move_fd(process_t * proc, long src, long dest);
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extern void initialize_process_tree(void);
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extern process_t * process_from_pid(pid_t pid);
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extern void process_delete(process_t * proc);
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extern void make_process_ready(volatile process_t * proc);
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extern volatile process_t * next_ready_process(void);
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extern int wakeup_queue(list_t * queue);
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extern int wakeup_queue_interrupted(list_t * queue);
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extern int sleep_on(list_t * queue);
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extern int sleep_on_unlocking(list_t * queue, spin_lock_t * release);
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extern int process_alert_node(process_t * process, void * value);
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extern void sleep_until(process_t * process, unsigned long seconds, unsigned long subseconds);
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extern void switch_task(uint8_t reschedule);
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extern int process_wait_nodes(process_t * process,fs_node_t * nodes[], int timeout);
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extern process_t * process_get_parent(process_t * process);
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extern int process_is_ready(process_t * proc);
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extern void wakeup_sleepers(unsigned long seconds, unsigned long subseconds);
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extern void task_exit(int retval);
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extern __attribute__((noreturn)) void switch_next(void);
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extern int process_awaken_from_fswait(process_t * process, int index);
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extern void process_awaken_signal(process_t * process);
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extern void process_release_directory(page_directory_t * dir);
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extern process_t * spawn_worker_thread(void (*entrypoint)(void * argp), const char * name, void * argp);
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extern pid_t fork(void);
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extern pid_t clone(uintptr_t new_stack, uintptr_t thread_func, uintptr_t arg);
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extern int waitpid(int pid, int * status, int options);
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extern int exec(const char * path, int argc, char *const argv[], char *const env[], int interp_depth);
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extern tree_t * process_tree; /* Parent->Children tree */
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extern list_t * process_list; /* Flat storage */
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extern list_t * process_queue; /* Ready queue */
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extern list_t * sleep_queue;
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extern void arch_enter_tasklet(void);
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extern __attribute__((noreturn)) void arch_resume_user(void);
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extern __attribute__((noreturn)) void arch_restore_context(volatile thread_t * buf);
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extern __attribute__((returns_twice)) int arch_save_context(volatile thread_t * buf);
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extern void arch_restore_floating(process_t * proc);
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extern void arch_save_floating(process_t * proc);
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extern void arch_set_kernel_stack(uintptr_t);
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extern void arch_enter_user(uintptr_t entrypoint, int argc, char * argv[], char * envp[], uintptr_t stack);
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__attribute__((noreturn))
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extern void arch_enter_signal_handler(uintptr_t,int);
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extern void arch_wakeup_others(void);
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