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-rw-r--r--include/globals.h7
-rw-r--r--include/lib/kmem.h4
-rw-r--r--include/sys/schedule.h13
-rw-r--r--include/util/lock.h1
-rw-r--r--include/util/mutex.h2
-rw-r--r--linker.ld4
-rw-r--r--src/drivers/uart.c1
-rw-r--r--src/exceptions/svc.S18
-rw-r--r--src/globals.c13
-rw-r--r--src/lib/kmem.c53
-rw-r--r--src/lib/strings.c8
-rw-r--r--src/sys/schedule.S2
-rw-r--r--src/sys/schedule.c67
-rw-r--r--src/tests/test.S2
-rw-r--r--src/util/lock.c8
-rw-r--r--src/util/mutex.c52
-rw-r--r--src/util/status.c10
17 files changed, 53 insertions, 212 deletions
diff --git a/include/globals.h b/include/globals.h
index 156968a..7bda83c 100644
--- a/include/globals.h
+++ b/include/globals.h
@@ -8,17 +8,14 @@ extern unsigned long cntfrq;
extern char* os_name;
extern char* os_info_v;
-extern unsigned char kmem_begin[0x2000000];
-extern unsigned char kmem_lookup[0xD000];
extern unsigned long nextpid;
-extern unsigned long sched_stack_count;
extern unsigned long stimel;
extern unsigned long stimeh;
-extern struct Drawer g_Drawer;
extern struct Scheduler scheduler;
extern struct Thread usrloopthread;
extern unsigned int gwidth, gheight, gpitch, gisrgb;
-extern unsigned char stacks_table[MAX_THREADS];
+extern unsigned char thread_table[MAX_THREADS];
+extern struct Thread threads[MAX_THREADS];
#endif
#endif
diff --git a/include/lib/kmem.h b/include/lib/kmem.h
index 67751cd..e942c0d 100644
--- a/include/lib/kmem.h
+++ b/include/lib/kmem.h
@@ -1,10 +1,6 @@
#ifndef LIB_KMEM_H
#define LIB_KMEM_H
-void* kmalloc(unsigned int size);
-void* kcalloc(unsigned int size);
-void kfree(void* ptr);
-
void kmemshow32(void* data, unsigned long length);
void kmemshow(void* data, unsigned long length);
diff --git a/include/sys/schedule.h b/include/sys/schedule.h
index 67f2f9c..397ab2e 100644
--- a/include/sys/schedule.h
+++ b/include/sys/schedule.h
@@ -4,7 +4,7 @@
// If TQUEUE_MAX is changed, ensure sys/schedule.S's value gets changed
#define TQUEUE_MAX 0x100
#define STACK_SIZE 0x4000
-#define TQUEUE_CNT 4
+#define TQUEUE_CNT 3
#define PRIORITIES 8
#define MAX_THREADS TQUEUE_MAX*PRIORITIES*TQUEUE_CNT
@@ -12,13 +12,6 @@ enum ThreadStatus {
THREAD_READY = 0,
THREAD_MWAIT = 1,
THREAD_SWAIT = 2,
- THREAD_SERROR = 3, // Stack Error
- THREAD_FINISH = 4, // Need to clean up
-};
-
-struct RStack {
- void* sp;
- unsigned long idx;
};
struct Thread {
@@ -31,7 +24,10 @@ struct Thread {
unsigned char preempt;
unsigned short status;
void* mptr;
+ unsigned long offset;
unsigned char old_priority;
+ unsigned char c_reserved;
+ unsigned short s_reserved;
};
struct ThreadRotBuffer {
@@ -44,7 +40,6 @@ struct ThreadQueues {
struct ThreadRotBuffer ready;
struct ThreadRotBuffer mwait;
struct ThreadRotBuffer swait;
- struct ThreadRotBuffer serror;
};
struct Scheduler {
diff --git a/include/util/lock.h b/include/util/lock.h
index f6f8f53..c5b2f7e 100644
--- a/include/util/lock.h
+++ b/include/util/lock.h
@@ -9,6 +9,5 @@ struct Lock {
void lock(struct Lock* l);
void unlock(struct Lock* l);
-struct Lock* create_lock(void);
#endif
diff --git a/include/util/mutex.h b/include/util/mutex.h
index 61237b8..ab318b4 100644
--- a/include/util/mutex.h
+++ b/include/util/mutex.h
@@ -15,6 +15,4 @@ struct Mutex {
void* addr;
} __attribute__((packed, aligned(4)));
-struct Mutex* create_mutex(void* addr);
-
#endif
diff --git a/linker.ld b/linker.ld
index 60f16de..dcb5a9b 100644
--- a/linker.ld
+++ b/linker.ld
@@ -34,6 +34,10 @@ SECTIONS
. = ALIGN(4096);
KEEP(*(.bss.kmem))
. = ALIGN(4096);
+ KEEP(*(.bss.threadl"))
+ . = ALIGN(4096);
+ KEEP(*(.bss.threads"))
+ . = ALIGN(4096);
*(.bss)
*(.bss.*)
KEEP(*(.bss.mmheap))
diff --git a/src/drivers/uart.c b/src/drivers/uart.c
index e4ae2d1..deaa84a 100644
--- a/src/drivers/uart.c
+++ b/src/drivers/uart.c
@@ -74,7 +74,6 @@ void uart_10(unsigned long val)
{
char* dptr = u32_to_str(val);
uart_string(dptr);
- kfree(dptr);
}
void uart_hexn(unsigned long c_val)
diff --git a/src/exceptions/svc.S b/src/exceptions/svc.S
index c23df82..1b0cc1f 100644
--- a/src/exceptions/svc.S
+++ b/src/exceptions/svc.S
@@ -33,22 +33,14 @@ svc_000001: // Get time
svc_000002: // Run Schedule
ldmfd sp!, {r0-r12,lr}
b schedule
-svc_000003: // Clean task stack
+svc_000003: // Free Thread in Table
ldr r3, =scheduler
ldr r2, [r3, #0] // struct Thread* rthread
- ldr r1, [r2, #8] // sp_base
- cmp r1, #-1
- beq svc_exit
- ldr r3, =stacks_table
+ ldr r1, [r2, #0x1c] // thread offset
mov r0, #0
- strb r0, [r3, r1]
- // Free the thread after freeing the stack
- mov r0, r2
- bl kfree
- ldr r3, =sched_stack_count
- ldr r2, [r3]
- sub r2, #1
- str r2, [r3]
+ ldr r2, =thread_table
+ add r2, r1
+ str r0, [r2]
b svc_exit
svc_000004: // Lock Lock (usr_r0 = struct Lock*)
ldr r3, =scheduler
diff --git a/src/globals.c b/src/globals.c
index e94580c..29760b6 100644
--- a/src/globals.c
+++ b/src/globals.c
@@ -1,6 +1,4 @@
#define GLOBALS_C
-#include <lib/kmem.h>
-#include <util/mutex.h>
#include <sys/schedule.h>
char* os_name = "Jobbed";
#ifndef VERSION
@@ -9,10 +7,7 @@ char* os_info_v = "?";
char* os_info_v = VERSION;
#endif
-__attribute__((section(".bss.kmem"))) unsigned char kmem_begin[0x2000000];
-__attribute__((section(".bss"))) unsigned char kmem_lookup[0xD000];
__attribute__((section(".bss"))) unsigned long nextpid;
-__attribute__((section(".bss"))) unsigned long sched_stack_count;
__attribute__((section(".bss"))) unsigned long stimel;
__attribute__((section(".bss"))) unsigned long stimeh;
__attribute__((section(".bss"))) struct Scheduler scheduler;
@@ -21,4 +16,10 @@ __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"))) unsigned char stacks_table[MAX_THREADS];
+// 0 - Free
+// 1 - Ready
+// 2 - Waiting for Mutex
+// 3 - Waiting for Signal
+// 4+ - Reserved
+__attribute__((section(".bss.threadl"))) unsigned char thread_table[MAX_THREADS];
+__attribute__((section(".bss.threads"))) struct Thread threads[MAX_THREADS];
diff --git a/src/lib/kmem.c b/src/lib/kmem.c
index 931d5e3..0419662 100644
--- a/src/lib/kmem.c
+++ b/src/lib/kmem.c
@@ -2,59 +2,6 @@
#include <drivers/uart.h>
#include <lib/kmem.h>
-void* kmalloc(unsigned int size)
-{
- unsigned int sz = 1;
- while (sz < size && sz < 0x1000)
- sz *= 2;
- unsigned long offset = 0x1000*(sz/2);
- unsigned int exp = 0;
- unsigned int tmp = sz;
- while (tmp != 0) {
- exp++;
- tmp = tmp >> 1;
- }
- unsigned int i = 0;
- while (i < 0x1000) {
- if (kmem_lookup[0x1000*exp + i] == 0) {
- kmem_lookup[0x1000*exp + i] = 1;
- return (void*)kmem_begin + offset + i*sz;
- }
- i++;
- }
- return 0;
-}
-
-void* kcalloc(unsigned int size)
-{
- unsigned char* ptr = kmalloc(size);
- if (ptr == 0)
- return 0;
- for(unsigned int i = 0; i < size; i++)
- ptr[i] = 0;
- return ptr;
-}
-
-void kfree(void* ptr)
-{
- if (!((unsigned long)kmem_begin <= (unsigned long)ptr && (unsigned long)ptr < (unsigned long)kmem_begin + 0x200000))
- return;
- unsigned long size = 1;
- while (!((unsigned long)kmem_begin + 0x1000*(size/2) <= (unsigned long)ptr && (unsigned long)ptr < (unsigned long)kmem_begin + 0x1000*size)) {
- size *= 2;
- }
- void* base = (void*)((unsigned long)ptr - ((unsigned long)ptr % size));
- void* block_base = kmem_begin + 0x1000*(size/2);
- unsigned int lookup_offset = (base - block_base)/size;
- unsigned int exp = 0;
- unsigned int tmp = size;
- while (tmp != 0) {
- exp++;
- tmp = tmp >> 1;
- }
- kmem_lookup[0x1000*exp + lookup_offset] = 0;
-}
-
void kmemshow32(void* data, unsigned long length)
{
unsigned long* ptr = data;
diff --git a/src/lib/strings.c b/src/lib/strings.c
index 53caaec..3155afa 100644
--- a/src/lib/strings.c
+++ b/src/lib/strings.c
@@ -36,7 +36,7 @@ unsigned char strcmpn(string_t a, string_t b, unsigned int n)
char* zhex32_to_str(unsigned long value)
{
- char* data = kcalloc(9);
+ static char data[10];
char tmp = 0;
char isz = -1;
for (int i = 0; i < 8; i++) {
@@ -53,7 +53,7 @@ char* zhex32_to_str(unsigned long value)
char* hex32_to_str(unsigned long value)
{
- char* data = kcalloc(9);
+ static char data[10];
char tmp = 0;
for (int i = 0; i < 8; i++) {
tmp = (value >> 4*(8-i-1))&0xF;
@@ -69,7 +69,7 @@ char* u32_to_str(unsigned long value)
{
unsigned long t = value;
unsigned long c;
- char* data = kcalloc(11);
+ static char data[12];
char* dptr = data + 9;
for (int i = 0; i <= 10; i++) {
c = t%10;
@@ -91,7 +91,7 @@ char* s32_to_str(unsigned long value)
t = -t;
is_neg = 1;
}
- char* data = kcalloc(12);
+ static char data[13];
char* dptr = data + 10;
for (int i = 0; i <= 10; i++) {
c = t%10;
diff --git a/src/sys/schedule.S b/src/sys/schedule.S
index e44d12b..d7301fc 100644
--- a/src/sys/schedule.S
+++ b/src/sys/schedule.S
@@ -35,7 +35,7 @@ cleanup:
mov r1, #0
1:
str r1, [r0, #0]
- // cleanup stack
+ // Free thread in table
svc #3
// usrloop -> rthread
ldr r3, =scheduler
diff --git a/src/sys/schedule.c b/src/sys/schedule.c
index b068963..8c65c6f 100644
--- a/src/sys/schedule.c
+++ b/src/sys/schedule.c
@@ -34,71 +34,54 @@ void init_scheduler(void)
trb += 1;
}
}
- sched_stack_count = 0;
// Initialize nextpid
nextpid = FIRST_AVAIL_PID;
+
+ for (unsigned long i = 0; i < MAX_THREADS; i++) {
+ struct Thread* t = &threads[i];
+ t->offset = i;
+ t->sp_base = 0x20000000 - STACK_SIZE*i;
+ }
}
-struct RStack get_stack(void)
+struct Thread* get_available_thread(void)
{
- struct RStack r = {.sp = 0, .idx = -1};
- // Find an available stack
- for (int i = 0; i < MAX_THREADS; i++) {
- if (stacks_table[i] == 0) {
- // Mark unavailable
- stacks_table[i] = 1;
- r.idx = i;
- r.sp = (void*)0x20000000 - STACK_SIZE*i;
- return r;
- }
+ for(unsigned long i = 0; i < MAX_THREADS; i++) {
+ if (thread_table[i] == 0)
+ return &threads[i];
}
- return r;
+ return 0;
}
void add_thread(void* pc, void* arg, unsigned char priority)
{
- //void* sp = get_stack();
- struct RStack r = get_stack();
- //struct Thread* thread = (struct Thread*)malloca(sizeof(struct Thread), 4);
- struct Thread* thread = (struct Thread*)kmalloc(sizeof(struct Thread));
+ struct Thread* thread = get_available_thread();
+ thread_table[thread->offset] = 1;
thread->pc = pc;
- // Valid stack has been obtained for this thread
- if (r.sp) {
- thread->sp_base = r.idx;
- unsigned long* argp = r.sp;
- argp -= 13;
- *argp = (unsigned long)arg; // Set r0 to the argument
- argp -= 1;
- *(unsigned long**)argp = (unsigned long*)cleanup; // Set lr to the cleanup function
- thread->sp = (void*)argp;
- thread->status = THREAD_READY;
- sched_stack_count++;
- }
- // Couldn't allocate a proper stack
- else {
- thread->sp_base = r.idx;
- thread->sp = r.sp;
- thread->status = THREAD_SERROR;
- }
+ unsigned long* argp = (void*)thread->sp_base;
+ argp -= 13;
+ *argp = (unsigned long)arg; // Set r0 to the argument
+ argp -= 1;
+ *(unsigned long**)argp = (unsigned long*)cleanup; // Set lr to the cleanup function
+ thread->sp = argp;
+ thread->status = THREAD_READY;
thread->mptr = (void*)0;
thread->pid = nextpid++;
// Reset next pid on overflow
if (nextpid < FIRST_AVAIL_PID) {
nextpid = FIRST_AVAIL_PID;
}
- thread->priority = priority % PRIORITIES;
+ if (priority >= PRIORITIES)
+ thread->priority = PRIORITIES - 1;
+ else
+ thread->priority = priority;
thread->old_priority = -1;
thread->preempt = 0;
// Add Thread* to scheduler's appropriate buffer
struct ThreadQueues* tq = &scheduler.thread_queues[thread->priority];
struct ThreadRotBuffer* trb;
// Add to stack error queue if stack was not obtained
- if (thread->status == THREAD_SERROR) {
- trb = &tq->serror;
- }
- else {
- trb = &tq->ready;
- }
+ trb = &tq->ready;
trb->queue[trb->woffset++] = thread;
trb->woffset %= TQUEUE_MAX;
// Schedule if this was called in usermode
diff --git a/src/tests/test.S b/src/tests/test.S
index ebb901c..035f8f6 100644
--- a/src/tests/test.S
+++ b/src/tests/test.S
@@ -1,6 +1,6 @@
.section .text
-btest:
+a.btest:
push {lr}
pop {pc}
diff --git a/src/util/lock.c b/src/util/lock.c
index 6c7d07e..95f93af 100644
--- a/src/util/lock.c
+++ b/src/util/lock.c
@@ -1,6 +1,5 @@
#include <cpu.h>
#include <cpu/atomic/swap.h>
-#include <lib/kmem.h>
#include <util/lock.h>
// TODO: Improve locking for system
@@ -25,10 +24,3 @@ void unlock(struct Lock* l)
atm_release((unsigned long*)l);
}
}
-
-struct Lock* create_lock(void)
-{
- struct Lock* l = (struct Lock*)kmalloc(sizeof(struct Lock));
- l->pid = 0;
- return l;
-}
diff --git a/src/util/mutex.c b/src/util/mutex.c
index 995ef62..e69de29 100644
--- a/src/util/mutex.c
+++ b/src/util/mutex.c
@@ -1,52 +0,0 @@
-#include <cpu/atomic/swap.h>
-#include <globals.h>
-#include <lib/kmem.h>
-#include <sys/schedule.h>
-#include <util/mutex.h>
-
-///unsigned char lock_mutex(struct Mutex* m, unsigned long pid)
-///{
-/// if (m->pid == NULL_PID) {
-/// // Use currently running thread's PID if no pid given
-/// if (pid == 0) {
-/// struct Thread* thread = scheduler.rthread;
-/// atm_lock(thread->pid, &m->pid);
-/// } else {
-/// atm_lock(pid, &m->pid);
-/// }
-/// return 0;
-/// }
-/// struct Thread* thread = scheduler.rthread;
-/// thread->status = THREAD_MWAIT;
-/// thread->mptr = m;
-/// return 1;
-///}
-///
-///// Eventually, there will need to be a hook into the scheduling mechanism
-///// that checks the currently running process and check that against the
-///// mutex's pid lock
-///unsigned char release_mutex(struct Mutex* m, unsigned long pid)
-///{
-/// // Use current thread's PID if no pid
-/// if (pid == 0) {
-/// struct Thread* thread = scheduler.rthread;
-/// if (m->pid == thread->pid) {
-/// atm_release(&m->pid);
-/// return 0;
-/// }
-/// }
-/// else if (m->pid == pid) {
-/// atm_release(&m->pid);
-/// return 0;
-/// }
-/// return 1;
-///}
-
-struct Mutex* create_mutex(void* addr)
-{
- // Ensure aligned to word - Important for Atomic Swap
- struct Mutex* m = (struct Mutex*)kmalloc(sizeof(struct Mutex));
- m->addr = addr;
- m->pid = 0;
- return m;
-}
diff --git a/src/util/status.c b/src/util/status.c
index 5aef915..828dfa3 100644
--- a/src/util/status.c
+++ b/src/util/status.c
@@ -64,11 +64,6 @@ void status(void)
draw_cstring(9, 0, "v", 0x00FFFF);
draw_cstring(0, 0, os_name, 0xFF0000);
draw_cstring(10, 0, os_info_v, 0x00FFFF);
- draw_cstring(16, 0, "# TStacks:", 0xFFDF00);
- draw_string(27, 0, " ");
- char* st_str = u32_to_str(sched_stack_count);
- draw_cstring(27, 0, st_str, 0xFFDF00);
- kfree(st_str);
// GPU IRQ Statuses
output_irq_status();
@@ -81,7 +76,6 @@ void status(void)
char* frq_str = u32_to_str(frq);
unsigned long fs_len = strlen(frq_str)+1;
draw_string(8, 3, frq_str);
- kfree(frq_str);
draw_string(8+fs_len, 3, "kHz");
// Output the value
unsigned long v = read_cntv_tval();
@@ -89,7 +83,6 @@ void status(void)
unsigned long vs_len = strlen(v_str) + 1;
draw_string(8+fs_len+4, 3, v_str);
draw_string(8+fs_len+4 +vs_len, 3, " ");
- kfree(v_str);
draw_letter(8+fs_len+4 +vs_len+1, 3, '|');
draw_hex32(8+fs_len+7+vs_len, 3, v);
@@ -99,12 +92,10 @@ void status(void)
gwidth_str = u32_to_str(gwidth);
unsigned long gs_len = strlen(gwidth_str) + 1;
draw_string(6, 4, gwidth_str);
- kfree(gwidth_str);
draw_letter(6+gs_len-1, 4, 'x');
gwidth_str = u32_to_str(gheight);
unsigned long gs_len1 = strlen(gwidth_str) + 1;
draw_string(6+gs_len, 4, gwidth_str);
- kfree(gwidth_str);
if(gisrgb)
draw_string(6+gs_len+gs_len1, 4, "RGB");
else
@@ -143,5 +134,4 @@ void status(void)
draw_string(19+14+18, 8, " ");
char* t_str = u32_to_str(((unsigned long)tval)/1000000);
draw_string(19+14+18, 8, t_str);
- kfree(t_str);
}
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-25 19:35:41 +0000