From: Mirela Simonovic <[email protected]> The MMU must be enabled during the resume path before restoring context, as virtual addresses are used to access the saved context data.
This patch adds MMU setup during resume by reusing the existing enable_secondary_cpu_mm function, which enables data cache and the MMU. Before the MMU is enabled, the content of TTBR0_EL2 is changed to point to init_ttbr (page tables used at runtime). Signed-off-by: Mirela Simonovic <[email protected]> Signed-off-by: Saeed Nowshadi <[email protected]> Signed-off-by: Mykyta Poturai <[email protected]> Signed-off-by: Mykola Kvach <[email protected]> --- Changes in v7: - no functional changes, just moved commit --- xen/arch/arm/arm64/head.S | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S index 72c7b24498..596e960152 100644 --- a/xen/arch/arm/arm64/head.S +++ b/xen/arch/arm/arm64/head.S @@ -561,6 +561,30 @@ END(efi_xen_start) #endif /* CONFIG_ARM_EFI */ +#ifdef CONFIG_SYSTEM_SUSPEND + +FUNC(hyp_resume) + /* Initialize the UART if earlyprintk has been enabled. */ +#ifdef CONFIG_EARLY_PRINTK + bl init_uart +#endif + PRINT_ID("- Xen resuming -\r\n") + + bl check_cpu_mode + bl cpu_init + + ldr x0, =start + adr x20, start /* x20 := paddr (start) */ + sub x20, x20, x0 /* x20 := phys-offset */ + ldr lr, =mmu_resumed + b enable_secondary_cpu_mm + +mmu_resumed: + b . +END(hyp_resume) + +#endif /* CONFIG_SYSTEM_SUSPEND */ + /* * Local variables: * mode: ASM -- 2.43.0
