From 26e0b96fa9c303194fe159037d69d9ec30355d07 Mon Sep 17 00:00:00 2001 From: Janosch Frank Date: Tue, 6 Oct 2020 05:42:47 -0400 Subject: [PATCH] pc-bios: s390x: Save PSW rework We don't need to save the ipl_continue variable in lowcore and have it limited to 32 bits because of the lowcore layout. Let's move it to a new 64 bit variable and get rid of the reset info struct. Signed-off-by: Janosch Frank Reviewed-by: Thomas Huth Message-Id: <20201006094249.50640-3-frankja@linux.ibm.com> Signed-off-by: Thomas Huth --- pc-bios/s390-ccw/jump2ipl.c | 33 +++++++++++++-------------------- 1 file changed, 13 insertions(+), 20 deletions(-) diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c index 767012bf0c..b6aad32def 100644 --- a/pc-bios/s390-ccw/jump2ipl.c +++ b/pc-bios/s390-ccw/jump2ipl.c @@ -13,20 +13,17 @@ #define KERN_IMAGE_START 0x010000UL #define RESET_PSW_MASK (PSW_MASK_SHORTPSW | PSW_MASK_64) -typedef struct ResetInfo { - uint64_t ipl_psw; - uint32_t ipl_continue; -} ResetInfo; +static uint64_t *reset_psw = 0, save_psw, ipl_continue; -static ResetInfo save; - -static void jump_to_IPL_2(void) +static void jump_to_IPL_addr(void) { - ResetInfo *current = 0; + __attribute__((noreturn)) void (*ipl)(void) = (void *)ipl_continue; - void (*ipl)(void) = (void *) (uint64_t) current->ipl_continue; - *current = save; - ipl(); /* should not return */ + /* Restore reset PSW */ + *reset_psw = save_psw; + + ipl(); + /* should not return */ } void jump_to_IPL_code(uint64_t address) @@ -46,15 +43,11 @@ void jump_to_IPL_code(uint64_t address) * content of non-BIOS memory after we loaded the guest, so we * save the original content and restore it in jump_to_IPL_2. */ - ResetInfo *current = 0; - - save = *current; - - current->ipl_psw = (uint64_t) &jump_to_IPL_2; - current->ipl_psw |= RESET_PSW_MASK; - current->ipl_continue = address & PSW_MASK_SHORT_ADDR; - - debug_print_int("set IPL addr to", current->ipl_continue); + save_psw = *reset_psw; + *reset_psw = (uint64_t) &jump_to_IPL_addr; + *reset_psw |= RESET_PSW_MASK; + ipl_continue = address; + debug_print_int("set IPL addr to", ipl_continue); /* Ensure the guest output starts fresh */ sclp_print("\n");