/** * Jump to what we hope is the init address of an image. * * This function does not return. * * @param init_addr Init address of target image */ static void jump_to_image(uintptr_t init_addr) { void (*resetvec)(void) = (void(*)(void))init_addr; /* * Jumping to any image asserts the signal to the Silego chip that that * EC is not in read-only firmware. (This is not technically true if * jumping from RO -> RO, but that's not a meaningful use case...). * * Pulse the signal long enough to set the latch in the Silego, then * drop it again so we don't leak power through the pulldown in the * Silego. */ gpio_set_level(GPIO_ENTERING_RW, 1); usleep(MSEC); gpio_set_level(GPIO_ENTERING_RW, 0); #ifdef CONFIG_USB_POWER_DELIVERY /* * Notify USB PD module that we are about to sysjump and give it time * to do what it needs. */ pd_prepare_sysjump(); usleep(5*MSEC); #endif /* Flush UART output unless the UART hasn't been initialized yet */ if (uart_init_done()) uart_flush_output(); /* Disable interrupts before jump */ interrupt_disable(); #ifdef CONFIG_DMA /* Disable all DMA channels to avoid memory corruption */ dma_disable_all(); #endif /* CONFIG_DMA */ /* Fill in preserved data between jumps */ jdata->reserved0 = 0; jdata->magic = JUMP_DATA_MAGIC; jdata->version = JUMP_DATA_VERSION; jdata->reset_flags = reset_flags; jdata->jump_tag_total = 0; /* Reset tags */ jdata->struct_size = sizeof(struct jump_data); /* Call other hooks; these may add tags */ hook_notify(HOOK_SYSJUMP); /* Jump to the reset vector */ resetvec(); }
/** * Jump to what we hope is the init address of an image. * * This function does not return. * * @param init_addr Init address of target image */ static void jump_to_image(uintptr_t init_addr) { void (*resetvec)(void) = (void(*)(void))init_addr; /* * Jumping to any image asserts the signal to the Silego chip that that * EC is not in read-only firmware. (This is not technically true if * jumping from RO -> RO, but that's not a meaningful use case...). * * Pulse the signal long enough to set the latch in the Silego, then * drop it again so we don't leak power through the pulldown in the * Silego. */ gpio_set_level(GPIO_ENTERING_RW, 1); usleep(MSEC); gpio_set_level(GPIO_ENTERING_RW, 0); #if defined(CONFIG_I2C) && !defined(CONFIG_I2C_SLAVE_ONLY) /* Prepare I2C module for sysjump */ i2c_prepare_sysjump(); #endif /* Flush UART output */ cflush(); /* Disable interrupts before jump */ interrupt_disable(); #ifdef CONFIG_DMA /* Disable all DMA channels to avoid memory corruption */ dma_disable_all(); #endif /* CONFIG_DMA */ /* Fill in preserved data between jumps */ jdata->reserved0 = 0; jdata->magic = JUMP_DATA_MAGIC; jdata->version = JUMP_DATA_VERSION; jdata->reset_flags = reset_flags; jdata->jump_tag_total = 0; /* Reset tags */ jdata->struct_size = sizeof(struct jump_data); /* Call other hooks; these may add tags */ hook_notify(HOOK_SYSJUMP); /* Jump to the reset vector */ resetvec(); }