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-rw-r--r--src/globals.S4
-rw-r--r--src/globals.c4
-rw-r--r--src/sys/core.c10
-rw-r--r--src/sys/schedule.S3
-rw-r--r--src/sys/schedule.c128
5 files changed, 137 insertions, 12 deletions
diff --git a/src/globals.S b/src/globals.S
index 3a5da83..f6ec57f 100644
--- a/src/globals.S
+++ b/src/globals.S
@@ -11,7 +11,3 @@ cmdidx:
.global cmd
cmd:
.space 2049
-
-.section ".bss.heap"
-mheap:
- .space 0x100000
diff --git a/src/globals.c b/src/globals.c
index 1313bd9..6e2e70c 100644
--- a/src/globals.c
+++ b/src/globals.c
@@ -12,8 +12,6 @@ char* os_info_v = VERSION;
__attribute__((section(".bss"))) unsigned long exe_cnt;
__attribute__((section(".bss"))) struct Mutex exe_cnt_m;
-__attribute__((section(".bss.mmheap"))) unsigned char rpi_heap[MAX_MM];
-__attribute__((section(".bss"))) void* rpi_heap_top;
__attribute__((section(".bss"))) unsigned long nextpid;
__attribute__((section(".bss"))) unsigned long stimel;
__attribute__((section(".bss"))) unsigned long stimeh;
@@ -24,4 +22,6 @@ __attribute__((section(".bss"))) unsigned int gwidth;
__attribute__((section(".bss"))) unsigned int gheight;
__attribute__((section(".bss"))) unsigned int gpitch;
__attribute__((section(".bss"))) unsigned int gisrgb;
+__attribute__((section(".bss.mmheap"))) unsigned char rpi_heap[MAX_MM];
+__attribute__((section(".bss.mmheap.base"))) void* rpi_heap_top;
__attribute__((section(".bss"))) unsigned char stacks_table[MAX_THREADS];
diff --git a/src/sys/core.c b/src/sys/core.c
index 1329c12..fc3d9e1 100644
--- a/src/sys/core.c
+++ b/src/sys/core.c
@@ -23,7 +23,6 @@ void sysinit(void)
// Clear System Globals
exe_cnt_m.addr = &exe_cnt;
exe_cnt_m.pid = NULL_PID;
- nextpid = SCHED_PID + 1;
rpi_heap_top = &rpi_heap;
stimeh = *(unsigned long*)SYS_TIMER_CHI;
stimel = *(unsigned long*)SYS_TIMER_CLO;
@@ -64,9 +63,12 @@ void sysinit(void)
enableirq();
enablefiq();
- //add_thread(testlocal, 0);
- //add_thread(testlocal, 1);
- //add_thread(testlocal, 3);
+ add_thread(testlocal, 0, 0);
+ add_thread(testlocal, 0, 1);
+ add_thread(testlocal, 0, 1);
+ add_thread(testlocal, 0, 3);
+ add_thread(testlocal, 0, 5);
+ uart_scheduler();
}
void testlocal1(void)
diff --git a/src/sys/schedule.S b/src/sys/schedule.S
index 4913034..f80b707 100644
--- a/src/sys/schedule.S
+++ b/src/sys/schedule.S
@@ -1,3 +1,6 @@
+// TODO: - Scheduler info function
+// - Get next thread
+// - Yield supervisor call
.section ".text"
.globl schedule
.macro preserve_ctx
diff --git a/src/sys/schedule.c b/src/sys/schedule.c
index 3aca0ff..e20abe7 100644
--- a/src/sys/schedule.c
+++ b/src/sys/schedule.c
@@ -1,18 +1,55 @@
#include <globals.h>
+#include <drivers/uart.h>
#include <sys/schedule.h>
+#include <util/mutex.h>
+
+void loop(void);
+void cleanup(void);
void init_scheduler(void)
{
// Set rthread to usrloopthread - an infinitely running thread so that the pointer will never be null
usrloopthread.pc = (void*)loop;
- usrloopthread.sp = 0x0FCC;
- usrloopthread.sp_base = 0x1000;
+ usrloopthread.sp = (void*)0x5FC8;
+ *(unsigned long**)usrloopthread.sp = (unsigned long*)loop;
+ usrloopthread.sp_base = (void*)0x6000;
usrloopthread.mptr = 0;
usrloopthread.pid = -1;
usrloopthread.priority = -1;
usrloopthread.status = THREAD_READY;
scheduler.rthread = &usrloopthread;
// Initialize Rotating Buffers
+ struct ThreadQueues* tq;
+ for (int i = 0; i < PRIORITIES; i++) {
+ tq = &scheduler.thread_queues[i];
+ struct ThreadRotBuffer* trb = &tq->ready;
+ trb->roffset = 0;
+ trb->woffset = 0;
+ for (int j = 0; j < TQUEUE_MAX; j++)
+ trb->queue[j] = 0;
+ trb = &tq->mwait;
+ trb->roffset = 0;
+ trb->woffset = 0;
+ for (int j = 0; j < TQUEUE_MAX; j++)
+ trb->queue[j] = 0;
+ trb = &tq->swait;
+ trb->roffset = 0;
+ trb->woffset = 0;
+ for (int j = 0; j < TQUEUE_MAX; j++)
+ trb->queue[j] = 0;
+ trb = &tq->finish;
+ trb->roffset = 0;
+ trb->woffset = 0;
+ for (int j = 0; j < TQUEUE_MAX; j++)
+ trb->queue[j] = 0;
+ trb = &tq->serror;
+ trb->roffset = 0;
+ trb->woffset = 0;
+ for (int j = 0; j < TQUEUE_MAX; j++)
+ trb->queue[j] = 0;
+ }
+ // Initialize nextpid
+ nextpid = SCHED_PID + 1;
}
void loop(void)
@@ -20,3 +57,90 @@ void loop(void)
while(1)
asm volatile ("wfe");
}
+
+void* get_stack(void)
+{
+ for (int i = 0; i < MAX_THREADS; i++) {
+ if (stacks_table[i] == 0) {
+ stacks_table[i] = 1;
+ return (void*)0x20000000 - STACK_SIZE*i;
+ }
+ }
+ return 0;
+}
+
+void add_thread(void* pc, void* arg, unsigned char priority)
+{
+ void* sp = get_stack();
+ struct Thread* thread = (struct Thread*)malloca(sizeof(struct Thread), 4);
+ thread->pc = pc;
+ if (sp) {
+ thread->sp_base = sp;
+ unsigned long* argp = sp;
+ argp -= 1;
+ *argp = (unsigned long)arg; // Set r0 to the argument
+ argp -= 13;
+ *(unsigned long**)argp = (unsigned long*)cleanup; // Set lr to the cleanup function
+ thread->sp = (void*)argp;
+ thread->status = THREAD_READY;
+ } else {
+ thread->sp_base = 0;
+ thread->sp = 0;
+ thread->status = THREAD_SERROR;
+ }
+ thread->mptr = (void*)0;
+ thread->pid = nextpid++;
+ thread->priority = priority % PRIORITIES;
+ thread->preempt = 0;
+ // Add Thread* to scheduler's appropriate buffer
+ struct ThreadQueues* tq = &scheduler.thread_queues[thread->priority];
+ struct ThreadRotBuffer* trb;
+ if (thread->status == THREAD_SERROR) {
+ trb = &tq->serror;
+ } else {
+ trb = &tq->ready;
+ }
+ trb->queue[trb->woffset++] = thread;
+ trb->woffset %= TQUEUE_MAX;
+}
+
+void uart_scheduler(void)
+{
+ uart_string("Scheduler Info\n==============\nCurrent\n");
+ uart_hex((unsigned long)scheduler.rthread);
+ uart_char(' ');
+ memshow32((void*)scheduler.rthread, 6);
+ struct ThreadQueues* tq;
+ for(int p = 0; p < PRIORITIES; p++) {
+ uart_string("Priority ");
+ uart_10(p);
+ uart_char('\n');
+ tq = &scheduler.thread_queues[p];
+ struct ThreadRotBuffer* trb;
+ trb = &tq->ready;
+ for(int i = 0; i < TQUEUE_CNT; i++) {
+ if (trb->roffset == trb->woffset) {
+ trb += 1;
+ continue;
+ }
+ uart_string("Queue ");
+ uart_10(i);
+ uart_char('\n');
+ unsigned long roffset = trb->roffset;
+ while (roffset != trb->woffset) {
+ uart_hex((unsigned long)&trb->queue[roffset]);
+ uart_char(' ');
+ memshow32((void*)trb->queue[roffset], 6);
+ memshow32((void*)trb->queue[roffset]->sp, 14);
+ roffset++;
+ roffset %= TQUEUE_MAX;
+ }
+ trb += 1;
+ }
+ }
+ uart_string("==============\n");
+}
+
+void cleanup(void)
+{
+}
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