/* * This file is part of the coreboot project. * * Copyright (C) 2013 Google Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* The cache-as-ram assembly file calls romstage_main() after setting up * cache-as-ram. romstage_main() will then call the mainboards's * mainboard_romstage_entry() function. That function then calls * romstage_common() below. The reason for the back and forth is to provide * common entry point from cache-as-ram while still allowing for code sharing. * Because we can't use global variables the stack is used for allocations -- * thus the need to call back and forth. */ static void *setup_stack_and_mttrs(void); static void program_base_addresses(void) { uint32_t reg; const uint32_t lpc_dev = PCI_DEV(0, LPC_DEV, LPC_FUNC); /* Memory Mapped IO registers. */ reg = PMC_BASE_ADDRESS | 2; pci_write_config32(lpc_dev, PBASE, reg); reg = IO_BASE_ADDRESS | 2; pci_write_config32(lpc_dev, IOBASE, reg); reg = ILB_BASE_ADDRESS | 2; pci_write_config32(lpc_dev, IBASE, reg); reg = SPI_BASE_ADDRESS | 2; pci_write_config32(lpc_dev, SBASE, reg); reg = MPHY_BASE_ADDRESS | 2; pci_write_config32(lpc_dev, MPBASE, reg); reg = RCBA_BASE_ADDRESS | 1; pci_write_config32(lpc_dev, RCBA, reg); /* IO Port Registers. */ reg = ACPI_BASE_ADDRESS | 2; pci_write_config32(lpc_dev, ABASE, reg); reg = GPIO_BASE_ADDRESS | 2; pci_write_config32(lpc_dev, GBASE, reg); } /* Entry from cache-as-ram.inc. */ void * asmlinkage romstage_main(unsigned long bist) { /* Call into mainboard. */ mainboard_romstage_entry(bist); return setup_stack_and_mttrs(); } /* Entry from the mainboard. */ void romstage_common(const struct romstage_params *params) { struct romstage_handoff *handoff; program_base_addresses(); byt_config_com1_and_enable(); console_init(); /* Initialize RAM */ raminit(params->mrc_params, 5); handoff = romstage_handoff_find_or_add(); if (handoff != NULL) handoff->s3_resume = 0; else printk(BIOS_DEBUG, "Romstage handoff structure not added!\n"); } static void open_up_spi(void) { const uintptr_t sbase = SPI_BASE_ADDRESS; /* Disable generating SMI when setting WPD bit. */ write32(sbase + 0xf8, read32(sbase + 0xf8) & ~(1 << 7)); /* Disable the SMM-only BIOS write and set WPD bit. */ write32(sbase + 0xfc, 1 | (read32(sbase + 0xfc) & ~(1 << 5))); } void asmlinkage romstage_after_car(void) { /* Allow BIOS to program SPI part. */ open_up_spi(); /* Load the ramstage. */ copy_and_run(); while (1); } static inline uint32_t *stack_push(u32 *stack, u32 value) { stack = &stack[-1]; *stack = value; return stack; } /* Romstage needs quite a bit of stack for decompressing images since the lzma * lib keeps its state on the stack during romstage. */ static unsigned long choose_top_of_stack(void) { unsigned long stack_top; const unsigned long romstage_ram_stack_size = 0x5000; /* cbmem_add() does a find() before add(). */ stack_top = (unsigned long)cbmem_add(CBMEM_ID_ROMSTAGE_RAM_STACK, romstage_ram_stack_size); stack_top += romstage_ram_stack_size; return stack_top; } /* setup_stack_and_mttrs() determines the stack to use after * cache-as-ram is torn down as well as the MTRR settings to use. */ static void *setup_stack_and_mttrs(void) { unsigned long top_of_stack; int num_mtrrs; uint32_t *slot; uint32_t mtrr_mask_upper; uint32_t top_of_ram; /* Top of stack needs to be aligned to a 4-byte boundary. */ top_of_stack = choose_top_of_stack() & ~3; slot = (void *)top_of_stack; num_mtrrs = 0; /* The upper bits of the MTRR mask need to set according to the number * of physical address bits. */ mtrr_mask_upper = (1 << ((cpuid_eax(0x80000008) & 0xff) - 32)) - 1; /* The order for each MTRR is value then base with upper 32-bits of * each value coming before the lower 32-bits. The reasoning for * this ordering is to create a stack layout like the following: * +0: Number of MTRRs * +4: MTRR base 0 31:0 * +8: MTRR base 0 63:32 * +12: MTRR mask 0 31:0 * +16: MTRR mask 0 63:32 * +20: MTRR base 1 31:0 * +24: MTRR base 1 63:32 * +28: MTRR mask 1 31:0 * +32: MTRR mask 1 63:32 */ /* Cache the ROM as WP just below 4GiB. */ slot = stack_push(slot, mtrr_mask_upper); /* upper mask */ slot = stack_push(slot, ~(CONFIG_ROM_SIZE - 1) | MTRRphysMaskValid); slot = stack_push(slot, 0); /* upper base */ slot = stack_push(slot, ~(CONFIG_ROM_SIZE - 1) | MTRR_TYPE_WRPROT); num_mtrrs++; /* Cache RAM as WB from 0 -> CONFIG_RAMTOP. */ slot = stack_push(slot, mtrr_mask_upper); /* upper mask */ slot = stack_push(slot, ~(CONFIG_RAMTOP - 1) | MTRRphysMaskValid); slot = stack_push(slot, 0); /* upper base */ slot = stack_push(slot, 0 | MTRR_TYPE_WRBACK); num_mtrrs++; top_of_ram = (uint32_t)cbmem_top(); /* Cache 8MiB below the top of ram. The top of ram under 4GiB is the * start of the TSEG region. It is required to be 8MiB aligned. Set * this area as cacheable so it can be used later for ramstage before * setting up the entire RAM as cacheable. */ slot = stack_push(slot, mtrr_mask_upper); /* upper mask */ slot = stack_push(slot, ~((8 << 20) - 1) | MTRRphysMaskValid); slot = stack_push(slot, 0); /* upper base */ slot = stack_push(slot, (top_of_ram - (8 << 20)) | MTRR_TYPE_WRBACK); num_mtrrs++; /* Cache 8MiB at the top of ram. Top of ram is where the TSEG * region resides. However, it is not restricted to SMM mode until * SMM has been relocated. By setting the region to cacheable it * provides faster access when relocating the SMM handler as well * as using the TSEG region for other purposes. */ slot = stack_push(slot, mtrr_mask_upper); /* upper mask */ slot = stack_push(slot, ~((8 << 20) - 1) | MTRRphysMaskValid); slot = stack_push(slot, 0); /* upper base */ slot = stack_push(slot, top_of_ram | MTRR_TYPE_WRBACK); num_mtrrs++; /* Save the number of MTRRs to setup. Return the stack location * pointing to the number of MTRRs. */ slot = stack_push(slot, num_mtrrs); return slot; }