Fix loading entryother. Now CPU1 can print OK.

src/arch/x86_64/boot/entryother.asm

@@ -27,11 +27,6 @@
 %define STA_R       0x2     ; Readable (executable segments)
 %define STA_A       0x1     ; Accessed
 
-global entryother_start
-global entryother_end
-
-entryother_start:
-
 section .text
 bits 16
 start:
@@ -60,6 +55,10 @@ start32:
   mov    fs, ax
   mov    gs, ax
 
+  ; debug
+  mov dword [0xb8000], 0x2f4b2f4f
+  hlt
+
   ; defer paging until we switch to 64bit mode
   ; set ebx=1 so shared boot code knows we're booting a secondary core
   mov    ebx, 1
@@ -91,6 +90,4 @@ gdt:
   db    0, (0x90 | STA_W), 0xcf, 0
 .desc:
   dw   ($ - gdt - 1)
-  dq   gdt
-
-entryother_end:
+  dq   gdt

src/arch/x86_64/boot/linker.ld

@@ -29,14 +29,15 @@ SECTIONS {
 
   /* bootloader for other processors */
 
-  real = .;                     /* backup va */
+  entryother_start = .;         /* backup va */
   . = OTHER_OFFSET;
-  .text.other : AT(real)
+  .text.other : AT(entryother_start)
   {
     KEEP(*/entryother.o (.text))
     . = ALIGN(4K);
   }
-  . = . - OTHER_OFFSET + real;  /* recover va */
+  entryother_end = . - OTHER_OFFSET + entryother_start;
+  . = entryother_end;           /* recover va */
 
   . += KERNEL_OFFSET;
 

src/arch/x86_64/smp.rs

@@ -2,7 +2,7 @@ use arch::driver::{acpi::ACPI_Result, apic::start_ap};
 use memory::{MemoryController, PhysicalAddress};
 
 extern {
-    fn entryother_start();
+    fn entryother_start();  // physical addr of entryother
     fn entryother_end();
 }
 
@@ -11,6 +11,7 @@ const ENTRYOTHER_ADDR: u32 = 0x7000;
 pub fn start_other_cores(acpi: &ACPI_Result, mc: &mut MemoryController) {
     mc.map_page_identity(ENTRYOTHER_ADDR as usize - 1);
     mc.map_page_identity(ENTRYOTHER_ADDR as usize);
+    mc.map_page_identity(entryother_start as usize);
     mc.map_page_p2v(PhysicalAddress(0));
     copy_entryother();
     let args = unsafe{ &mut *(ENTRYOTHER_ADDR as *mut EntryArgs).offset(-1) };
@@ -22,6 +23,7 @@ pub fn start_other_cores(acpi: &ACPI_Result, mc: &mut MemoryController) {
             stack: 0x8000, // just enough stack to get us to entry64mp
         };
         start_ap(apic_id, ENTRYOTHER_ADDR);
+        loop{}
     }
 
 }