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Diffstat (limited to 'docs/porting-guide.md')
| -rw-r--r-- | docs/porting-guide.md | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/docs/porting-guide.md b/docs/porting-guide.md index 0b071118..c0e6acea 100644 --- a/docs/porting-guide.md +++ b/docs/porting-guide.md @@ -188,8 +188,9 @@ the implementer chooses. In the ARM FVP port, they are implemented in bytes) of the largest cache line amongst all caches implemented in the system. A pointer to this memory should be exported with the name `platform_normal_stacks`. This pointer is used by the common platform helper - function `platform_set_stack()` to allocate a stack to each CPU in the - platform (see [../plat/common/aarch64/platform_helpers.S]). + functions `platform_set_stack()` (to allocate a stack for each CPU in the + platform) & `platform_get_stack()` (to return the base address of that + stack) (see [../plat/common/aarch64/platform_helpers.S]). 2.2 Common optional modifications @@ -262,6 +263,20 @@ The size of the stack allocated to each CPU is specified by the platform defined constant `PLATFORM_STACK_SIZE`. +### Function : platform_get_stack() + + Argument : unsigned long + Return : unsigned long + +This function uses the `platform_normal_stacks` pointer variable to return the +base address of the stack memory reserved for a CPU. Further details are given +in the description of the `platform_normal_stacks` variable below. A CPU is +identified by its `MPIDR`, which is passed as the argument. + +The size of the stack allocated to each CPU is specified by the platform defined +constant `PLATFORM_STACK_SIZE`. + + ### Function : plat_report_exception() Argument : unsigned int |