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-rw-r--r--include/sys/schedule.h9
-rw-r--r--src/cpu/irq.c9
-rw-r--r--src/drivers/uart.S2
-rw-r--r--src/graphics/lfb.c11
-rw-r--r--src/lib/mem.c1
-rw-r--r--src/sys/core.c29
-rw-r--r--src/sys/kernel.S1
-rw-r--r--src/sys/schedule.S86
-rw-r--r--src/sys/schedule.c3
-rw-r--r--src/sys/timer.c2
10 files changed, 101 insertions, 52 deletions
diff --git a/include/sys/schedule.h b/include/sys/schedule.h
index e10018c..58c7312 100644
--- a/include/sys/schedule.h
+++ b/include/sys/schedule.h
@@ -65,7 +65,14 @@ void schedule_c(void);
void schedule_irq(void);
void cleanup(void);
void sched_info(void);
-void yield(void);
+struct LL* get_next_thread(void);
+
+static inline void yield(void)
+{
+ struct Thread* t = scheduler.rthread_ll->data;
+ t->data.status = THREAD_WAITING;
+ schedule();
+}
static inline void preserve_stack(struct Thread* thread)
{
diff --git a/src/cpu/irq.c b/src/cpu/irq.c
index 0d6e9de..aa7c375 100644
--- a/src/cpu/irq.c
+++ b/src/cpu/irq.c
@@ -4,6 +4,7 @@
#include <symbols.h>
#include <sys/core.h>
#include <sys/kernel.h>
+#include <sys/schedule.h>
#include <sys/timer.h>
#include <util/mutex.h>
#include <util/status.h>
@@ -105,4 +106,12 @@ void c_irq_handler(void)
void localtest(void)
{
+ struct Thread* t = scheduler.rthread_ll->data;
+ uart_string("Running IRQ Task... ");
+ uart_10(t->data.pid);
+ uart_char('\n');
+ uart_string("Finished! ");
+ uart_10(t->data.pid);
+ uart_char('\n');
+ sched_info();
}
diff --git a/src/drivers/uart.S b/src/drivers/uart.S
index e476799..cde6c11 100644
--- a/src/drivers/uart.S
+++ b/src/drivers/uart.S
@@ -49,5 +49,5 @@ uart_hex.hloop:
uart_hex.print:
str r1, [r2]
subs r3, #1
- bge uart_hex.hloop
+ bge uart_hex.loop // Jump back to wait for availablilty
pop {r4, pc}
diff --git a/src/graphics/lfb.c b/src/graphics/lfb.c
index 39d921d..3ad9917 100644
--- a/src/graphics/lfb.c
+++ b/src/graphics/lfb.c
@@ -8,6 +8,9 @@
unsigned int width, height, pitch, isrgb; /* dimensions and channel order */
unsigned char *lfb; /* raw frame buffer address */
+#define SCR_WIDTH 1024
+#define SCR_HEIGHT 768
+
/**
* Set screen resolution to 1024x768
*/
@@ -19,14 +22,14 @@ void lfb_init(void)
mbox[2] = 0x48003; //set phy wh
mbox[3] = 8;
mbox[4] = 8;
- mbox[5] = 1024; //FrameBufferInfo.width
- mbox[6] = 768; //FrameBufferInfo.height
+ mbox[5] = SCR_WIDTH; //FrameBufferInfo.width
+ mbox[6] = SCR_HEIGHT; //FrameBufferInfo.height
mbox[7] = 0x48004; //set virt wh
mbox[8] = 8;
mbox[9] = 8;
- mbox[10] = 1024; //FrameBufferInfo.virtual_width
- mbox[11] = 768; //FrameBufferInfo.virtual_height
+ mbox[10] = SCR_WIDTH; //FrameBufferInfo.virtual_width
+ mbox[11] = SCR_HEIGHT; //FrameBufferInfo.virtual_height
mbox[12] = 0x48009; //set virt offset
mbox[13] = 8;
diff --git a/src/lib/mem.c b/src/lib/mem.c
index f8a8cc5..ed6d23f 100644
--- a/src/lib/mem.c
+++ b/src/lib/mem.c
@@ -47,6 +47,7 @@ unsigned char memcmp32(unsigned long* a, unsigned long* b, unsigned int n)
static unsigned char rpi_heap[MAX_MM] = {0,};
static void* rpi_heap_top = &rpi_heap;
+// TODO: Put size at end and cleanup from tail
void* malloc(unsigned char size)
{
unsigned char* mem = (unsigned char*)rpi_heap;
diff --git a/src/sys/core.c b/src/sys/core.c
index e590e5c..b492548 100644
--- a/src/sys/core.c
+++ b/src/sys/core.c
@@ -50,19 +50,16 @@ void sysinit(void)
lfb_init();
lfb_showpicture();
+ // Start Scheduler
+ init_scheduler();
+
// Enable IRQ & FIQ
enableirq();
enablefiq();
- // Start Scheduler
- init_scheduler();
add_thread(testlocal, 0);
add_thread(testlocal, 1);
add_thread(testlocal, 3);
- //delay(0x20000000);
- schedule();
- heap_info();
- sched_info();
}
struct Mutex testm = {.addr = (void*)0xDEADBEEF, .pid = NULL_PID};
@@ -95,5 +92,23 @@ void testlocal(void)
add_thread(testlocal1, 1);
schedule();
}
- uart_string("Done!\n");
+ if (t->data.pid == 3) {
+ yield();
+ yield();
+ yield();
+ yield();
+ yield();
+ yield();
+ yield();
+ // Example
+ /*
+ while (uart_tx_full) {
+ t->data.status = THREAD_WAITING;
+ schedule();
+ } // Will wait until uart_tx is not full
+ */
+ }
+ uart_string("Done! ");
+ uart_10(t->data.pid);
+ uart_char('\n');
}
diff --git a/src/sys/kernel.S b/src/sys/kernel.S
index e0333ca..cee385d 100644
--- a/src/sys/kernel.S
+++ b/src/sys/kernel.S
@@ -4,6 +4,7 @@
kernel_main:
bl sysinit
kernel_main.loop:
+ //bl schedule
wfe
b kernel_main.loop
diff --git a/src/sys/schedule.S b/src/sys/schedule.S
index 302c4d8..aa33942 100644
--- a/src/sys/schedule.S
+++ b/src/sys/schedule.S
@@ -1,32 +1,52 @@
-.section .text
+.section ".text"
.globl schedule
// TODO: Implement Scheduler for IRQ
+
+// Save Context
+// reg = struct cpu_context*
+.macro save_context reg
+ str r4, [\reg, #0x00]
+ str r5, [\reg, #0x04]
+ str r6, [\reg, #0x08]
+ str r7, [\reg, #0x0c]
+ str r8, [\reg, #0x10]
+ str r9, [\reg, #0x14]
+ str r10, [\reg, #0x18]
+ str r11, [\reg, #0x1c]
+ str r12, [\reg, #0x20]
+ str lr, [\reg, #0x24]
+.endm
+// Restore Context
+// reg = struct cpu_context*
+.macro restore_context reg
+ ldr r4, [\reg, #0x00]
+ ldr r5, [\reg, #0x04]
+ ldr r6, [\reg, #0x08]
+ ldr r7, [\reg, #0x0c]
+ ldr r8, [\reg, #0x10]
+ ldr r9, [\reg, #0x14]
+ ldr r10, [\reg, #0x18]
+ ldr r11, [\reg, #0x1c]
+ ldr r12, [\reg, #0x20]
+ ldr lr , [\reg, #0x24]
+.endm
+
// Implemented the scheduler in Assembly since the C defined was messing around with the program stacks
// This way, I can be confident that the stacks will be unchanged
schedule:
ldr r3, =scheduler
- // r3 = struct Scheduler*
// Preserve context
- //add r0, r3, #4 // struct cpu_context* ctx
ldr r0, [r3, #4]
// r0 = struct cpu_context*
- str r4, [r0, #0x00]
- str r5, [r0, #0x04]
- str r6, [r0, #0x08]
- str r7, [r0, #0x0c]
- str r8, [r0, #0x10]
- str r9, [r0, #0x14]
- str r10, [r0, #0x18]
- str r11, [r0, #0x1c]
- str r12, [r0, #0x20]
- str lr, [r0, #0x24]
+ save_context r0
// Get the next available thread
- push {r3, lr}
+ push {r1-r3, lr}
bl get_next_thread
- // r0 = struct LL* next_thread_ll
- pop {r3, lr}
+ pop {r1-r3, lr}
ldr r1, [r3, #0]
+ // r3 = struct Scheduler*
+ // r0 = struct LL* next_thread_ll
// r1 = struct LL* current_thread_ll
// Check if there is a valid currently running thread
cmp r1, #0
@@ -34,11 +54,20 @@ schedule:
schedule.current_thread_exists:
cmp r0, r1
beq schedule.run_current
+ cmp r0, #0
+ moveq r0, r1 // Make the current running thread the next running thread if no next running thread
// Next is not the same as the current
// Preserve stack of current
ldr r2, [r1, #0x8] // struct Thread* current
+ ldrh r1, [r2, #0x0e]
+ cmp r1, #2 // THREAD_WAITING
+ beq schedule.temp_status
+ cmp r1, #1 // THREAD_RUNNING
+ bne schedule.dont_modify_status
+schedule.temp_status:
mov r1, #0 // THREAD_READY
strh r1, [r2, #0x0e]
+schedule.dont_modify_status:
str sp, [r2, #0x4] // void* stack // Preserve stack
// Preserve program counter of current
str lr, [r2, #0x0] // void* thread // Preserve pc
@@ -84,16 +113,7 @@ schedule.dont_overwrite_sys_stack:
schedule.run_current:
// Restore context
ldr r2, [r3, #0x4] // struct cpu_context* ctx // Set new context
- ldr r4, [r2, #0x00]
- ldr r5, [r2, #0x04]
- ldr r6, [r2, #0x08]
- ldr r7, [r2, #0x0c]
- ldr r8, [r2, #0x10]
- ldr r9, [r2, #0x14]
- ldr r10, [r2, #0x18]
- ldr r11, [r2, #0x1c]
- ldr r12, [r2, #0x20]
- ldr lr, [r2, #0x24]
+ restore_context r2
// Run
ldr r1, [r3, #0]
// r1 = struct LL* rthread_ll
@@ -117,17 +137,7 @@ schedule.no_next_thread:
mov r1, #0
str r1, [r0] // Clear stack pointer
schedule.exit:
- // Restore context
- ldr r2, [r3, #0x4] // struct cpu_context* ctx // Set new context
// Restore register context
- ldr r4, [r2, #0x00]
- ldr r5, [r2, #0x04]
- ldr r6, [r2, #0x08]
- ldr r7, [r2, #0x0c]
- ldr r8, [r2, #0x10]
- ldr r9, [r2, #0x14]
- ldr r10, [r2, #0x18]
- ldr r11, [r2, #0x1c]
- ldr r12, [r2, #0x20]
- ldr lr, [r2, #0x24]
+ ldr r2, [r3, #0x4] // struct cpu_context* ctx // Set new context
+ restore_context r2
bx lr
diff --git a/src/sys/schedule.c b/src/sys/schedule.c
index ac5b3e2..1b02476 100644
--- a/src/sys/schedule.c
+++ b/src/sys/schedule.c
@@ -15,6 +15,7 @@ struct Scheduler scheduler = {
{.prev = 0, .next = 0, .data = 0},
},
.rthread_ll = 0,
+ .ctx = 0,
};
unsigned long syssp = 0;
struct cpu_context syscpu = {
@@ -183,4 +184,6 @@ void sched_info(void)
}
uart_char('\n');
}
+ uart_string("Stacks:\n");
+ memshow32((unsigned long*)stacks_table, 6);
}
diff --git a/src/sys/timer.c b/src/sys/timer.c
index 5a3b8d4..d35ef83 100644
--- a/src/sys/timer.c
+++ b/src/sys/timer.c
@@ -9,7 +9,7 @@
#include <symbols.h>
/// Cycles Per Second
-#define CPS 10
+#define CPS 100
#define SYS_TIMER_C
static unsigned long exe_cnt = 0;
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-25 18:16:21 +0000