234 lines
6.8 KiB
C++
234 lines
6.8 KiB
C++
/*
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* \brief NOVA-specific convenience functions
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* \author Norman Feske
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* \author Sebastian Sumpf
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* \author Alexander Boettcher
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* \date 2010-01-19
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*/
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/*
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* Copyright (C) 2010-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _NOVA_UTIL_H_
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#define _NOVA_UTIL_H_
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/* Genode includes */
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#include <base/printf.h>
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/* NOVA includes */
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#include <nova/syscalls.h>
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/* local includes */
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#include <echo.h>
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#include <util.h>
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enum { verbose_local_map = false };
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/**
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* Return boot CPU number. It is required if threads in core should be placed
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* on the same CPU as the main thread.
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*/
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inline Genode::addr_t boot_cpu()
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{
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/**
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* Initial value of ax and di register, saved by the crt0 startup code
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* and SOLELY VALID in 'core' !!!
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*
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* For x86_32 - __initial_ax contains the number of the boot CPU.
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* For x86_64 - __initial_di contains the number of the boot CPU.
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*/
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extern Genode::addr_t __initial_ax;
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extern Genode::addr_t __initial_di;
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return (sizeof(void *) > 4) ? __initial_di : __initial_ax;
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}
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/**
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* Establish a mapping
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*
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* \param utcb UTCB of the calling EC
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* \param src_crd capability range descriptor of source
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* resource to map locally
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* \param dst_crd capability range descriptor of mapping
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* target
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* \param kern_pd Whether to map the items from the kernel or from core
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* \param dma_mem Whether the memory is usable for DMA or not
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*
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* This functions sends a message from the calling EC to the echo EC.
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* The calling EC opens a receive window and the echo EC creates a transfer
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* item of the message and replies. The kernel will map during the reply
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* from the echo EC to the calling EC.
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*/
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static int map_local(Nova::Utcb *utcb, Nova::Crd src_crd, Nova::Crd dst_crd,
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bool kern_pd = false, bool dma_mem = false)
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{
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/* open receive window at current EC */
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utcb->crd_rcv = dst_crd;
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/* tell echo thread what to map */
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utcb->msg[0] = src_crd.value();
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utcb->msg[1] = 0;
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utcb->msg[2] = kern_pd;
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utcb->msg[3] = dma_mem;
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utcb->set_msg_word(4);
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/* establish the mapping via a portal traversal during reply phase */
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Nova::uint8_t res = Nova::call(echo()->pt_sel());
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if (res != Nova::NOVA_OK || utcb->msg_words() != 1 || !utcb->msg[0] ||
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utcb->msg_items() != 1) {
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PERR("Failure - map_local 0x%lx:%lu:%u->0x%lx:%lu:%u - call result=%x"
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" utcb=%x:%x:%lx !!! utcb=%p kern=%u",
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src_crd.addr(), src_crd.order(), src_crd.type(),
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dst_crd.addr(), dst_crd.order(), dst_crd.type(), res,
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utcb->msg_items(), utcb->msg_words(), utcb->msg[0], utcb, kern_pd);
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return res > 0 ? res : -1;
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}
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/* clear receive window */
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utcb->crd_rcv = 0;
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return 0;
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}
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static inline int unmap_local(Nova::Crd crd, bool self = true) {
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return Nova::revoke(crd, self); }
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inline int map_local_phys_to_virt(Nova::Utcb *utcb, Nova::Crd src,
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Nova::Crd dst) {
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return map_local(utcb, src, dst, true); }
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inline int map_local_one_to_one(Nova::Utcb *utcb, Nova::Crd crd) {
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return map_local(utcb, crd, crd, true); }
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/**
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* Find least significant set bit in value
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*/
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inline unsigned char
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lsb_bit(unsigned long const &value, unsigned char const shift = 0)
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{
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unsigned long const scan = value >> shift;
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if (scan == 0) return 0;
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unsigned char pos = __builtin_ctzl(scan);
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unsigned char res = shift ? pos + shift : pos;
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return res;
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}
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/**
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* Remap pages in the local address space
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*
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* \param utcb UTCB of the main thread
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* \param from_start physical source address
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* \param to_start local virtual destination address
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* \param num_pages number of pages to map
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*/
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inline int map_local(Nova::Utcb *utcb,
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Genode::addr_t from_start, Genode::addr_t to_start,
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Genode::size_t num_pages,
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Nova::Rights const &permission,
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bool kern_pd = false, bool dma_mem = false)
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{
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if (verbose_local_map)
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Genode::printf("::map_local: from %lx to %lx, %zd pages from kernel %u\n",
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from_start, to_start, num_pages, kern_pd);
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using namespace Nova;
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using namespace Genode;
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size_t const size = num_pages << get_page_size_log2();
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addr_t const from_end = from_start + size;
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addr_t const to_end = to_start + size;
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for (addr_t offset = 0; offset < size; ) {
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addr_t const from_curr = from_start + offset;
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addr_t const to_curr = to_start + offset;
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/*
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* The common alignment corresponds to the number of least significant
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* zero bits in both addresses.
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*/
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addr_t const common_bits = from_curr | to_curr;
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/* find least set bit in common bits */
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size_t order = lsb_bit(common_bits, get_page_size_log2());
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/* look if flexpage fits into both 'from' and 'to' address range */
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if ((from_end - from_curr) < (1UL << order))
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order = log2(from_end - from_curr);
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if ((to_end - to_curr) < (1UL << order))
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order = log2(to_end - to_curr);
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if (verbose_local_map)
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Genode::printf("::map_local: order %zx %lx:%lx %lx:%lx\n",
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order, from_curr, from_end, to_curr, to_end);
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int const res = map_local(utcb,
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Mem_crd((from_curr >> 12), order - get_page_size_log2(), permission),
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Mem_crd((to_curr >> 12), order - get_page_size_log2(), permission),
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kern_pd, dma_mem);
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if (res) return res;
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/* advance offset by current flexpage size */
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offset += (1UL << order);
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}
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return 0;
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}
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/**
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* Unmap pages from the local address space
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*
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* \param utcb UTCB of the main thread
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* \param start local virtual address
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* \param num_pages number of pages to unmap
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* \param self unmap from this pd or solely from other pds
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* \param self map from this pd or solely from other pds
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* \param rights rights to be revoked, default: all rwx
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*/
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inline void unmap_local(Nova::Utcb *utcb, Genode::addr_t start,
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Genode::size_t num_pages,
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bool const self = true,
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Nova::Rights const rwx = Nova::Rights(true, true, true))
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{
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using namespace Nova;
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using namespace Genode;
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Genode::addr_t base = start >> get_page_size_log2();
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if (start & (get_page_size() - 1)) {
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PERR("unmap failed - unaligned address specified");
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return;
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}
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if (verbose_local_map)
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PINF("Unmapping local: range 0x%lx+0x%zx", base, num_pages);
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while (num_pages) {
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unsigned char const base_bit = lsb_bit(base);
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unsigned char const order_bit = min(log2(num_pages), 31U);
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unsigned char const order = min(order_bit, base_bit);
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Mem_crd const crd(base, order, rwx);
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if (verbose_local_map)
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PINF("Unmapping local: 0x%lx+0x%lx", crd.base(),
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1UL << crd.order());
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unmap_local(crd, self);
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num_pages -= 1UL << order;
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base += 1UL << order;
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}
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}
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#endif /* _NOVA_UTIL_H_ */
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