Changeset 65f3117 in mainline for kernel/arch

Timestamp:

2023-02-25T13:16:38Z (3 years ago)

Author:

Jiří Zárevúcky <zarevucky.jiri@…>

Branches:

master, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

6188fee

Parents:

4f84ee42

git-author:

Jiří Zárevúcky <zarevucky.jiri@…> (2023-02-14 13:38:14)

git-committer:

Jiří Zárevúcky <zarevucky.jiri@…> (2023-02-25 13:16:38)

Message:

Make bootstrap stack statically, rather than dynamically allocated

With aligment requirements being part of the language now, it is
simple to allocate the extra stack area in kernel data, and we
don't need to go to so much trouble with manual allocation.
It also makes it slightly more straightforward to use the stack
from assembly, without having to dig through a saved context
structure.

Location:

kernel/arch

Files:

• amd64/src/smp/ap.S (modified) (1 diff)
• ia32/src/smp/ap.S (modified) (1 diff)
• mips32/src/mm/frame.c (modified) (1 diff)
• sparc64/src/sun4u/start.S (modified) (1 diff)

kernel/arch/amd64/src/smp/ap.S

@@ -98 +98 @@
 .code64
 start64:
-        movabsq $ctx, %rsp
-        movq CONTEXT_OFFSET_SP(%rsp), %rsp
+        movabsq $bootstrap_stack_top, %rsp
+        movq (%rsp), %rsp
 
+        pushq $0
         pushq $0
         movq %rsp, %rbp

kernel/arch/ia32/src/smp/ap.S

@@ -75 +75 @@
         movw %ax, %es
         movw %ax, %ss
-        movl $KA2PA(ctx), %eax          /* KA2PA((uintptr_t) &ctx) */
-        movl CONTEXT_OFFSET_SP(%eax), %esp
+        movl $KA2PA(bootstrap_stack_top), %eax   /* KA2PA((uintptr_t) &bootstrap_stack_top) */
+        movl (%eax), %esp
         leal KA2PA(0)(%esp), %esp       /* KA2PA(ctx.sp) */
 

kernel/arch/mips32/src/mm/frame.c

@@ -111 +111 @@
         if (overlaps(frame << ZERO_PAGE_WIDTH, ZERO_PAGE_SIZE,
             KA2PA(config.base), config.kernel_size))
-                return false;
-
-        /* Kernel stack */
-        if (overlaps(frame << ZERO_PAGE_WIDTH, ZERO_PAGE_SIZE,
-            KA2PA(config.stack_base), config.stack_size))
                 return false;
 

kernel/arch/sparc64/src/sun4u/start.S

@@ -356 +356 @@
          * in the ctx global variable.
          */
-        set ctx, %g1
-        add %g1, CONTEXT_OFFSET_SP, %g1
+        set bootstrap_stack_top, %g1
         ldx [%g1], %o6