diff options
Diffstat (limited to 'plat/fvp/aarch64/plat_helpers.S')
| -rw-r--r-- | plat/fvp/aarch64/plat_helpers.S | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/plat/fvp/aarch64/plat_helpers.S b/plat/fvp/aarch64/plat_helpers.S index 00579035..f1c2c09b 100644 --- a/plat/fvp/aarch64/plat_helpers.S +++ b/plat/fvp/aarch64/plat_helpers.S @@ -31,10 +31,139 @@ #include <arch.h> #include <asm_macros.S> #include <bl_common.h> +#include <gic_v2.h> #include <platform.h> +#include "../drivers/pwrc/fvp_pwrc.h" + .globl platform_get_entrypoint + .globl plat_secondary_cold_boot_setup + .globl platform_mem_init .globl plat_report_exception + .macro platform_choose_gicmmap param1, param2, x_tmp, w_tmp, res + ldr \x_tmp, =VE_SYSREGS_BASE + V2M_SYS_ID + ldr \w_tmp, [\x_tmp] + ubfx \w_tmp, \w_tmp, #SYS_ID_BLD_SHIFT, #SYS_ID_BLD_LENGTH + cmp \w_tmp, #BLD_GIC_VE_MMAP + csel \res, \param1, \param2, eq + .endm + + /* ----------------------------------------------------- + * void plat_secondary_cold_boot_setup (void); + * + * This function performs any platform specific actions + * needed for a secondary cpu after a cold reset e.g + * mark the cpu's presence, mechanism to place it in a + * holding pen etc. + * TODO: Should we read the PSYS register to make sure + * that the request has gone through. + * ----------------------------------------------------- + */ +func plat_secondary_cold_boot_setup + /* --------------------------------------------- + * Power down this cpu. + * TODO: Do we need to worry about powering the + * cluster down as well here. That will need + * locks which we won't have unless an elf- + * loader zeroes out the zi section. + * --------------------------------------------- + */ + mrs x0, mpidr_el1 + ldr x1, =PWRC_BASE + str w0, [x1, #PPOFFR_OFF] + + /* --------------------------------------------- + * Deactivate the gic cpu interface as well + * --------------------------------------------- + */ + ldr x0, =VE_GICC_BASE + ldr x1, =BASE_GICC_BASE + platform_choose_gicmmap x0, x1, x2, w2, x1 + mov w0, #(IRQ_BYP_DIS_GRP1 | FIQ_BYP_DIS_GRP1) + orr w0, w0, #(IRQ_BYP_DIS_GRP0 | FIQ_BYP_DIS_GRP0) + str w0, [x1, #GICC_CTLR] + + /* --------------------------------------------- + * There is no sane reason to come out of this + * wfi so panic if we do. This cpu will be pow- + * ered on and reset by the cpu_on pm api + * --------------------------------------------- + */ + dsb sy + wfi +cb_panic: + b cb_panic + + + /* ----------------------------------------------------- + * void platform_get_entrypoint (unsigned int mpid); + * + * Main job of this routine is to distinguish between + * a cold and warm boot. + * On a cold boot the secondaries first wait for the + * platform to be initialized after which they are + * hotplugged in. The primary proceeds to perform the + * platform initialization. + * On a warm boot, each cpu jumps to the address in its + * mailbox. + * + * TODO: Not a good idea to save lr in a temp reg + * TODO: PSYSR is a common register and should be + * accessed using locks. Since its not possible + * to use locks immediately after a cold reset + * we are relying on the fact that after a cold + * reset all cpus will read the same WK field + * ----------------------------------------------------- + */ +func platform_get_entrypoint + mov x9, x30 // lr + mov x2, x0 + ldr x1, =PWRC_BASE + str w2, [x1, #PSYSR_OFF] + ldr w2, [x1, #PSYSR_OFF] + ubfx w2, w2, #PSYSR_WK_SHIFT, #PSYSR_WK_MASK + cbnz w2, warm_reset + mov x0, x2 + b exit +warm_reset: + /* --------------------------------------------- + * A per-cpu mailbox is maintained in the tru- + * sted DRAM. Its flushed out of the caches + * after every update using normal memory so + * its safe to read it here with SO attributes + * --------------------------------------------- + */ + ldr x10, =TZDRAM_BASE + MBOX_OFF + bl platform_get_core_pos + lsl x0, x0, #CACHE_WRITEBACK_SHIFT + ldr x0, [x10, x0] + cbz x0, _panic +exit: + ret x9 +_panic: b _panic + + + /* ----------------------------------------------------- + * void platform_mem_init (void); + * + * Zero out the mailbox registers in the TZDRAM. The + * mmu is turned off right now and only the primary can + * ever execute this code. Secondaries will read the + * mailboxes using SO accesses. In short, BL31 will + * update the mailboxes after mapping the tzdram as + * normal memory. It will flush its copy after update. + * BL1 will always read the mailboxes with the MMU off + * ----------------------------------------------------- + */ +func platform_mem_init + ldr x0, =TZDRAM_BASE + MBOX_OFF + mov w1, #PLATFORM_CORE_COUNT +loop: + str xzr, [x0], #CACHE_WRITEBACK_GRANULE + subs w1, w1, #1 + b.gt loop + ret + /* --------------------------------------------- * void plat_report_exception(unsigned int type) * Function to report an unhandled exception |