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WIP on kernel syscalls

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This commit is contained in:
ngiddings
2021-05-01 17:09:50 -05:00
parent 7caf49065d
commit c962a83ff0
14 changed files with 142 additions and 31 deletions
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77
src/kernel.c
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@@ -3,6 +3,7 @@
#include "stdio.h"
#include "elf.h"
#include "context.h"
#include "string.h"
#include "types/status.h"
syscall_t syscall_table[32];
@@ -79,13 +80,14 @@ int load_module(struct kernel_t *kernel, struct module_t *module)
}
kernel->resource_table->array[index].type = RESOURCE_PROCESS;
kernel->resource_table->array[index].process.priority = 1;
kernel->resource_table->array[index].process.resource_id = index;
kernel->resource_table->array[index].process.state = module_context;
kernel->resource_table->array[index].process.page_table = current_address_space();
queue_insert(kernel->priority_queue, &kernel->resource_table->array[index].process);
return S_OK;
}
struct process_state_t *next_process(struct kernel_t *kernel, struct process_state_t *prev_state)
struct process_context_t *next_process(struct kernel_t *kernel, struct process_context_t *prev_state)
{
if(prev_state != NULL)
{
@@ -102,6 +104,79 @@ struct process_state_t *next_process(struct kernel_t *kernel, struct process_sta
panic("no processes available to enter!");
}
int terminate_process(struct kernel_t *kernel, size_t process_id)
{
if(kernel == NULL)
{
return S_NULL_POINTER;
}
else if(kernel->resource_table->limit >= process_id)
{
return S_OUT_OF_BOUNDS;
}
else if(kernel->resource_table->array[process_id].type != RESOURCE_PROCESS)
{
return S_INVALID_ARGUMENT;
}
struct process_t *process = &kernel->resource_table->array[process_id].process;
kernel->resource_table->array[process_id].type = RESOURCE_UNAVAILABLE;
if(kernel->active_process == process)
{
kernel->active_process = NULL;
}
queue_remove(kernel->priority_queue, process);
return S_OK;
}
int accept_message(struct kernel_t *kernel, size_t process_id, struct message_t *message)
{
if(kernel == NULL || message == NULL)
{
return S_NULL_POINTER;
}
else if(kernel->resource_table->limit >= process_id)
{
return S_OUT_OF_BOUNDS;
}
else if(kernel->resource_table->array[process_id].type != RESOURCE_PROCESS)
{
return S_INVALID_ARGUMENT;
}
struct process_t *process = &kernel->resource_table->array[process_id].process;
process->state = PROCESS_WAITING;
process->message = message;
if(kernel->active_process == process)
{
kernel->active_process = NULL;
}
queue_remove(kernel->priority_queue, process);
return S_OK;
}
int send_message(struct kernel_t *kernel, size_t process_id, const struct message_t *message)
{
if(kernel == NULL || message == NULL)
{
return S_NULL_POINTER;
}
else if(kernel->resource_table->limit >= process_id)
{
return S_OUT_OF_BOUNDS;
}
else if(kernel->resource_table->array[process_id].type != RESOURCE_PROCESS)
{
return S_INVALID_ARGUMENT;
}
struct process_t *process = &kernel->resource_table->array[process_id].process;
if(process->state != PROCESS_WAITING || process->message == NULL)
{
return S_BUSY;
}
queue_insert(kernel->priority_queue, kernel->active_process);
struct message_t buffer = *message;
}
void panic(const char *message)
{
printf("panic: %s", message);