From 95ba4c87f5f4802e2afaeae38003db5e7235864a Mon Sep 17 00:00:00 2001 From: Thaminda Edirisooriya Date: Wed, 26 Aug 2015 14:54:31 -0700 Subject: riscv-trap-handling: Add implementation for trap calls in riscv RISCV requires the bios/bootloader to set up an interface by which it can get information about memory, talk to host devices, etc. Put implementation for spike in src/mainboard/emulation/spike-riscv/spike_util.c, and src/arch/riscv/trap_handler.c Change-Id: Ie1d5f361595e48fa6cc1fac25485ad623ecdc717 Signed-off-by: Thaminda Edirisooriya Reviewed-on: http://review.coreboot.org/11368 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich --- src/mainboard/emulation/spike-riscv/spike_util.c | 136 +++++++++++++++++++++++ 1 file changed, 136 insertions(+) (limited to 'src/mainboard/emulation/spike-riscv/spike_util.c') diff --git a/src/mainboard/emulation/spike-riscv/spike_util.c b/src/mainboard/emulation/spike-riscv/spike_util.c index b34ff4a0d0..9edc62da2b 100644 --- a/src/mainboard/emulation/spike-riscv/spike_util.c +++ b/src/mainboard/emulation/spike-riscv/spike_util.c @@ -1,4 +1,140 @@ +/* + * Copyright (c) 2013, The Regents of the University of California (Regents). + * All Rights Reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the Regents nor the + * names of its contributors may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, + * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING + * OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS + * BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED + * HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE + * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + */ + #include +#include +#include +#include +#include + +uintptr_t translate_address(uintptr_t vAddr) { + // TODO: implement the page table translation algorithm + //uintptr_t pageTableRoot = read_csr(sptbr); + uintptr_t physAddrMask = 0xfffffff; + uintptr_t translationResult = vAddr & physAddrMask; + printk(BIOS_DEBUG, "Translated virtual address 0x%llx to physical address 0x%llx\n", vAddr, translationResult); + return translationResult; +} + +uintptr_t mcall_query_memory(uintptr_t id, memory_block_info *p) +{ + uintptr_t physicalAddr = translate_address((uintptr_t) p); + memory_block_info *info = (memory_block_info*) physicalAddr; + if (id == 0) { + info->base = 0x1000000; // hard coded for now, but we can put these values somewhere later + info->size = 0x7F000000 - info->base; + return 0; + } + + return -1; +} + +uintptr_t mcall_send_ipi(uintptr_t recipient) +{ + //if (recipient >= num_harts) + //return -1; + + if (atomic_swap(&OTHER_HLS(recipient)->ipi_pending, 1) == 0) { + mb(); + write_csr(send_ipi, recipient); + } + + return 0; +} + +uintptr_t mcall_clear_ipi(void) +{ + // only clear SSIP if no other events are pending + if (HLS()->device_response_queue_head == NULL) { + clear_csr(mip, MIP_SSIP); + mb(); + } + + return atomic_swap(&HLS()->ipi_pending, 0); +} + +uintptr_t mcall_shutdown(void) +{ + while (1) write_csr(mtohost, 1); + return 0; +} + +uintptr_t mcall_set_timer(unsigned long long when) +{ + write_csr(mtimecmp, when); + clear_csr(mip, MIP_STIP); + set_csr(mie, MIP_MTIP); + return 0; +} + +uintptr_t mcall_dev_req(sbi_device_message *m) +{ + if ((m->dev > 0xFFU) | (m->cmd > 0xFFU) | (m->data > 0x0000FFFFFFFFFFFFU)) return -EINVAL; + + while (swap_csr(mtohost, TOHOST_CMD(m->dev, m->cmd, m->data)) != 0); + + m->sbi_private_data = (uintptr_t)HLS()->device_request_queue_head; + HLS()->device_request_queue_head = m; + HLS()->device_request_queue_size++; + + return 0; +} + +uintptr_t mcall_dev_resp(void) +{ + htif_interrupt(0, 0); + + sbi_device_message* m = HLS()->device_response_queue_head; + if (m) { + //printm("resp %p\n", m); + sbi_device_message* next = (void*)atomic_read(&m->sbi_private_data); + HLS()->device_response_queue_head = next; + if (!next) { + HLS()->device_response_queue_tail = 0; + + // only clear SSIP if no other events are pending + clear_csr(mip, MIP_SSIP); + mb(); + if (HLS()->ipi_pending) set_csr(mip, MIP_SSIP); + } + } + return (uintptr_t)m; +} + +uintptr_t mcall_hart_id(void) +{ + return HLS()->hart_id; +} + +void hls_init(uint32_t hart_id) +{ + memset(HLS(), 0, sizeof(*HLS())); + HLS()->hart_id = hart_id; +} uintptr_t htif_interrupt(uintptr_t mcause, uintptr_t* regs) { uintptr_t fromhost = swap_csr(mfromhost, 0); -- cgit v1.2.3