Merge branch 'funny' into 'mommy'

Funny

See merge request fekhesk/vap!1

assembly/ppc32/get_real.S

@@ -20,18 +20,12 @@ vap_get_real:
     // enter real mode
     mtsrr0 5
     mfmsr 31
-    // MSR_IR (1 << 5) = 0
-    // MSR_DR (1 << 4) = 0
-    // MSR_EE (1 << 15) = 0
-    lis 30, ~0@h
-    ori 30, 30, ~((1 << 15) | (1 << 5) | (1 << 4))@l
-    and 31, 31, 30
-    mtsrr1 31
+    li 31, (1 << ((32-1) - 19))
+    mtmsr 31
 
     // now we can rfi to so_real
     sync
     isync
-    rfi
 .global vap_get_fake
 .extern VAP_KERN_BASE
 .extern VAP_KERN_PHOF
@@ -39,44 +33,7 @@ vap_get_real:
 vap_get_fake:
     // we are now in actual real mode, the registers shouldn't have changed
 
-    // first things first, use the translation table to remap the kernel's memory
-
-    #define PAGE_WIDTH 12
-    #define PAGE_SIZE (1 << PAGE_WIDTH)
-
-    // some values for page copying, very much inspired by helenos's ppc32 port
-    li 31, PAGE_SIZE >> 2
-    li 30, 0
-
-    page_copy:
-        cmpwi 4, 0 // are we at 0 pages (done)?
-        beq page_copy_done // if so, jump to the end
-
-        mtctr 31 // set the counter to PAGE_SIZE >> 2
-        lwz 29, 0(3) // load the physical address of the page to copy
-
-        page_copy_loop:
-            lwz 28, 0(29) // load the word to copy
-            stw 28, 0(30) // store the word to the new page
-
-            // ensure everything's synced
-            dcbst 0, 30
-            sync
-            icbi 0, 30
-            sync
-            isync
-
-            addi 29, 29, 4 // increment the source pointer
-            addi 30, 30, 4 // increment the destination pointer
-        bdnz page_copy_loop // loop
-        // end of page_copy_loop
-        // increment the translation table pointer
-        addi 3, 3, 4
-        // decrement the number of pages left
-        subi 4, 4, 1
-    b page_copy // loop
-
-    page_copy_done:
+    // for the first 256MiB, virtual=physical
 
     // normally i'd write register names as their true values, but with the bat registers
     // that'd just make things purely unreadable
@@ -116,138 +73,24 @@ vap_get_fake:
     mtspr dbat3u, 30
     mtspr dbat3l, 30
 
-    // here we define a macro for calculating the bat register values
-    // the bat registers are referred to as "upper" and "lower" registers
-    // the upper register contains the virtual address of the page, and the lower register contains
-    // the physical address of the page, as well as some other information
-    // if you want to learn more about this, i'd recommend reading this pdf:
-    // http://www.cs.cmu.edu/~412-s05/projects/9mac/PowerPC_Memory.pdf
-    // there are two notable things about this macro:
-    // 1. lower and upper are registers that the lower and upper bat registers should be set to
-    //    their initial values do not matter
-    // 2. i kinda just stole this from helenos, i'm sorry ):
-.macro BAT_COMPUTE base size mask lower upper kern_base
-    lis \upper, 0x0002
-    cmpw \size, \upper // check if we have less than 128kib remaining to map
-    blt finish_bat // if so, jump to the end
+    // now we can set up the bat registers
+    li 7, ((0x7FF<<2)|2)
+    li 8, ((2<<3)|2)
 
-    li \upper, 18
-    srw \mask, \size, \upper // calculate the mask (size >> 18)
+    sync
+    isync
 
-    // create the block length mask by duplicating the leading 1 14 times
-    // the block length mask indicates the length by number of bits set
-    li \upper, 14
-    mtctr \upper
-    li \upper, 1
-    0:
-        srw \lower, \mask, \upper
-        or \mask, \mask, \lower
-    bdnz 0b
-    // end of 0:
-    // & the mask with 0x07ff to assure that we map at most 256mib
-    andi. \mask, \mask, 0x07ff
+    mtspr dbat0u, 7
+    mtspr dbat0l, 8
+    sync
+    isync
+    mtspr ibat0u, 7
+    mtspr ibat0l, 8
+    sync
+    isync
 
-    // calculate the upper register
-    // the upper register contains:
-    // 1. the virtual address of the page
-    // 2. the block length mask
-    // 3. kernel access bit (1 << 2)
-    // 4. user access bit (1 << 1)
-    // we don't have a userspace yet! so we'll just set the kernel access bit to 1
-    // and the user access bit to 0
-    li \upper, 2
-    slw \mask, \mask, \upper
-    ori \mask, \mask, 0x0002
+    // zero the rest
 
-    lis \upper, (\kern_base + \base)@l
-    or \upper, \upper, \mask
-
-    // calculate the lower register
-    // the lower register contains:
-    // 1. the physical address of the page
-    // 2. storage access controls
-    // 3. protection bits
-    lis \lower, \base
-    ori \lower, \lower, 0x0002
-.endm
-
-    // now we are finally ready to set the bat registers!
-    // we will load into r29 either 256MiB or the remaining memory amount, whichever is smaller
-    lis 30, 268435456@h
-    ori 30, 30, 268435456@l
-    // reminder that r7 contains the amount of memory we have
-    cmpw 7, 30
-    blt bat0_memsmaller
-
-    // 256mib is smaller
-    mr 29, 30
-    b bat0_constsmaller
-
-    bat0_memsmaller:
-        mr 29, 7
-    bat0_constsmaller:
-    BAT_COMPUTE 0x0000 29 28 27 26 VAP_KERN_PHOF
-    mtspr ibat0u, 26
-    mtspr ibat0l, 27
-    mtspr dbat0u, 26
-    mtspr dbat0l, 27
-
-    // now we will do the same thing for bat 1
-    sub 7, 7, 29 // decrement the amount of memory left
-
-    cmpw 7, 30
-    blt bat1_memsmaller
-
-    // 256mib is smaller
-    mr 29, 30
-    b bat1_constsmaller
-
-    bat1_memsmaller:
-        mr 29, 7
-    bat1_constsmaller:
-    BAT_COMPUTE 0x1000 29 28 27 26 VAP_KERN_PHOF
-    mtspr ibat1u, 26
-    mtspr ibat1l, 27
-    mtspr dbat1u, 26
-    mtspr dbat1l, 27
-
-    // now we will do the same thing for bat 2
-    sub 7, 7, 29 // decrement the amount of memory left
-
-    cmpw 7, 30
-    blt bat2_memsmaller
-
-    // 256mib is smaller
-    mr 29, 30
-    b bat2_constsmaller
-
-    bat2_memsmaller:
-        mr 29, 7
-    bat2_constsmaller:
-    BAT_COMPUTE 0x2000 29 28 27 26 VAP_KERN_PHOF
-    mtspr ibat2u, 26
-    mtspr ibat2l, 27
-    mtspr dbat2u, 26
-    mtspr dbat2l, 27
-
-    // now we will do the same thing for bat 3
-    sub 7, 7, 29 // decrement the amount of memory left
-
-    cmpw 7, 30
-    blt bat3_memsmaller
-
-    // 256mib is smaller
-    mr 29, 30
-    b bat3_constsmaller
-
-    bat3_memsmaller:
-        mr 29, 7
-    bat3_constsmaller:
-    BAT_COMPUTE 0x3000 29 28 27 26 VAP_KERN_PHOF
-    mtspr ibat3u, 26
-    mtspr ibat3l, 27
-    mtspr dbat3u, 26
-    mtspr dbat3l, 27
 
     finish_bat:
     // theoretically, we should be done with the bat registers now
@@ -260,7 +103,8 @@ vap_get_fake:
     // we need to set the srr1 register to the value of the msr register
     // but also re-enable MSR_IR and MSR_DR so that we can use the bat registers
     mfmsr 31
-    ori 31, 31, ((1 << 5) | (1 << 4))@l
+    li 31, ((1 << ((32-1) - 19)) | (1 << ((32-1) - 26)) | (1 << ((32-1) - 27)))
+    // enable bit 30 to allow system resets to be recoverable
     mtsrr1 31
 
     //mr 1, 8 // restore the stack pointer

src/bootstrap.rs

@@ -55,12 +55,7 @@ pub fn bootstrap() -> ! {
 
     debug!("phys_translation_table: {:x}", phys_translation_table);
     debug!("page_count: {:x}", page_count);
-    debug!("kernal base: {:x}", VAP_KERN_BASE as usize);
-    debug!("vap_get_real: {:x}", vap_get_real as usize);
-    debug!("phys_get_fake: {:x}", phys_get_fake);
-    debug!("vap_get_fake: {:x}", vap_get_fake as usize);
-    debug!("so_fake: {:x}", so_fake as usize);
-    debug!("phys_so_fake: {:x}", translate_to_phys(so_fake as usize).unwrap());
+    debug!("phys_vap_get_fake: {:x}", phys_vap_get_fake);
     debug!("mem_size: {:x}", mem_size);
     debug!("vap_stack: {:x}", VAP_STACK as usize);
     debug!("openfirmware entry fn: {:x}", unsafe {
@@ -70,7 +65,7 @@ pub fn bootstrap() -> ! {
     debug!("filled vap allocator with available memory, see you on the flip side!");
 
     unsafe {
-        vap_get_real(phys_translation_table, page_count, phys_get_fake, so_fake as usize, mem_size, VAP_STACK as usize);
+        vap_get_real(phys_translation_table, page_count, phys_vap_get_fake, finalize_bootstrapping as usize, mem_size);
     }
 }
 
@@ -85,9 +80,11 @@ extern "C" fn test1() {
 
 #[no_mangle]
 pub extern "C" fn finalize_bootstrapping() -> ! {
-    //test1();
-    panic!("test");
-    memory::ppc32::allocation::VapAllocator::init();
+    // we made it!
+    debug!("hiiii");
+    let available = get_available_memory();
+    debug!("available memory: {:?}", available);
+    memory::VapAllocator::init(available);
     debug!("initialised vap allocator");
     debug!("patching interrupt vectors");
     patch_interrupt_vectors();

src/main.rs

@@ -3,6 +3,7 @@
 #![feature(lang_items)]
 #![feature(asm_experimental_arch)]
 #![feature(once_cell)]
+#![feature(lazy_cell)]
 #![no_std]
 #![no_main]
 
@@ -252,6 +253,12 @@ pub fn kernel_main() -> ! {
         stack_pointer
     };
 
-    println!("bootstrapping");
-    bootstrap::bootstrap();
+    println!("initializing scheduler");
+    scheduling::add_task(None, kernel_callback).expect("failed to add kernel callback task");
+
+    //debug!("constructing terminal window");
+    //terminal::construct_terminal_window();
+    //macros::USE_RAW.store(false, core::sync::atomic::Ordering::SeqCst);
+    unsafe { scheduling::init_scheduler() };
+    loop {}
 }

src/scheduling.rs

@@ -137,6 +137,7 @@ pub extern "C" fn scheduler_callback(savestate: *const SaveState) -> ! {
                 // set the stack pointer to the end of the stack
                 task.savestate.sp = stack as u32 + 0x100000;
                 task.stack_base = stack as usize;
+                //debug!("added task {} to scheduler", task.uuid);
 
                 // if the next task points to a task that isn't empty, then we need to push the task
                 if scheduler.tasks.get(scheduler.next_task as usize).is_none() || scheduler.tasks[scheduler.next_task as usize].is_some() {
@@ -227,8 +228,7 @@ pub extern "C" fn scheduler_callback(savestate: *const SaveState) -> ! {
         // reset the last_run value of the task with the highest priority
         scheduler.tasks[index_with_highest_priority].as_mut().unwrap().last_run = 0;
 
-        // set the current task to the task with the highest priority
-        scheduler.current_task = scheduler.tasks[index_with_highest_priority].as_mut().unwrap().uuid;
+    //debug!("now running task {} with srr0 {:x}", scheduler.current_task, scheduler.tasks[index_with_highest_priority].as_mut().unwrap().savestate.srr0);
 
         // return to the task with the highest priority
         unsafe {