void pre_init(void) { int error; set_putchar(putchar_putchar); /* Camkes adds nothing to our address space, so this array is empty */ void *existing_frames[] = { NULL }; camkes_make_simple(&camkes_simple); camkes_simple.IOPort_cap = simple_ioport_wrapper; camkes_simple.frame_cap = simple_frame_cap_wrapper; /* Initialize allocator */ allocman = bootstrap_use_current_1level( simple_get_cnode(&camkes_simple), simple_get_cnode_size_bits(&camkes_simple), simple_last_valid_cap(&camkes_simple) + 1, BIT(simple_get_cnode_size_bits(&camkes_simple)), sizeof(allocator_mempool), allocator_mempool ); assert(allocman); error = allocman_add_simple_untypeds(allocman, &camkes_simple); make_proxy_vka(&vka, allocman); /* Initialize the vspace */ error = sel4utils_bootstrap_vspace(&vspace, &vspace_data, simple_get_init_cap(&camkes_simple, seL4_CapInitThreadPD), &vka, NULL, NULL, existing_frames); assert(!error); /* Create temporary mapping reservation, and map in a frame to * create any book keeping */ reservation_t reservation; reservation.res = allocman_mspace_alloc(allocman, sizeof(sel4utils_res_t), &error); assert(reservation.res); void *reservation_vaddr; error = sel4utils_reserve_range_no_alloc(&vspace, reservation.res, PAGE_SIZE_4K, seL4_AllRights, 1, &reservation_vaddr); assert(!error); error = vspace_new_pages_at_vaddr(&vspace, reservation_vaddr, 1, seL4_PageBits, reservation); assert(!error); vspace_unmap_pages(&vspace, reservation_vaddr, 1, seL4_PageBits, VSPACE_FREE); proxy_give_vspace(&vka, &vspace, reservation_vaddr, reservation); sel4utils_reserve_range_no_alloc(&vspace, &muslc_brk_reservation_memory, BRK_VIRTUAL_SIZE, seL4_AllRights, 1, &muslc_brk_reservation_start); muslc_this_vspace = &vspace; muslc_brk_reservation = (reservation_t){.res = &muslc_brk_reservation_memory}; }
void reset_resources(void) { simple_t simple; camkes_make_simple(&simple); int i; seL4_CPtr root = simple_get_cnode(&simple); int error; /* revoke any of our initial untyped resources */ for (i = 0; i < simple_get_untyped_count(&simple); i++) { uint32_t size_bits; uint32_t paddr; seL4_CPtr ut = simple_get_nth_untyped(&simple, i, &size_bits, &paddr); error = seL4_CNode_Revoke(root, ut, 32); assert(error == seL4_NoError); } /* delete anything from any slots that should be empty */ for (i = simple_last_valid_cap(&simple) + 1; i < BIT(simple_get_cnode_size_bits(&simple)); i++) { error = seL4_CNode_Delete(root, i, 32); } /* save some pieces of the bss that we actually don't want to zero */ char save_sysinfo[4]; char save_libc[34]; char save_morecore_area[4]; char save_morecore_size[4]; memcpy(save_libc, __libc, 34); memcpy(save_sysinfo, __sysinfo, 4); memcpy(save_morecore_area, morecore_area, 4); memcpy(save_morecore_size, morecore_size, 4); /* zero the bss */ memset(__bss_start, 0, (uintptr_t)__bss_end - (uintptr_t)__bss_start); /* restore these pieces */ memcpy(__libc, save_libc, 34); memcpy(__sysinfo, save_sysinfo, 4); memcpy(morecore_area, save_morecore_area, 4); memcpy(morecore_size, save_morecore_size, 4); mutex_reinitializable_vm_lock_init(); }
int main(void) { UNUSED int error; /* Set up logging and give us a name: useful for debugging if the thread faults */ zf_log_set_tag_prefix("hello-3:"); name_thread(seL4_CapInitThreadTCB, "hello-3"); /* get boot info */ info = seL4_GetBootInfo(); /* init simple */ simple_default_init_bootinfo(&simple, info); /* print out bootinfo and other info about simple */ simple_print(&simple); /* create an allocator */ allocman = bootstrap_use_current_simple(&simple, ALLOCATOR_STATIC_POOL_SIZE, allocator_mem_pool); ZF_LOGF_IF(allocman == NULL, "Failed to initialize alloc manager.\n" "\tMemory pool sufficiently sized?\n" "\tMemory pool pointer valid?\n"); /* create a vka (interface for interacting with the underlying allocator) */ allocman_make_vka(&vka, allocman); /* get our cspace root cnode */ seL4_CPtr cspace_cap; cspace_cap = simple_get_cnode(&simple); /* get our vspace root page directory */ seL4_CPtr pd_cap; pd_cap = simple_get_pd(&simple); /* create a new TCB */ vka_object_t tcb_object = {0}; error = vka_alloc_tcb(&vka, &tcb_object); ZF_LOGF_IFERR(error, "Failed to allocate new TCB.\n" "\tVKA given sufficient bootstrap memory?"); /* * create and map an ipc buffer: */ /* TODO 1: get a frame cap for the ipc buffer */ /* hint: vka_alloc_frame() * int vka_alloc_frame(vka_t *vka, uint32_t size_bits, vka_object_t *result) * @param vka Pointer to vka interface. * @param size_bits Frame size: 2^size_bits * @param result Structure for the Frame object. This gets initialised. * @return 0 on success * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_1: */ vka_object_t ipc_frame_object; error = vka_alloc_frame(&vka, IPCBUF_FRAME_SIZE_BITS, &ipc_frame_object); ZF_LOGF_IFERR(error, "Failed to alloc a frame for the IPC buffer.\n" "\tThe frame size is not the number of bytes, but an exponent.\n" "\tNB: This frame is not an immediately usable, virtually mapped page.\n") /* * map the frame into the vspace at ipc_buffer_vaddr. * To do this we first try to map it in to the root page directory. * If there is already a page table mapped in the appropriate slot in the * page diretory where we can insert this frame, then this will succeed. * Otherwise we first need to create a page table, and map it in to * the page directory, before we can map the frame in. */ seL4_Word ipc_buffer_vaddr = IPCBUF_VADDR; /* TODO 2: try to map the frame the first time */ /* hint 1: seL4_ARCH_Page_Map() * The *ARCH* versions of seL4 sys calls are abstractions over the architecture provided by libsel4utils * this one is defined as: * #define seL4_ARCH_Page_Map seL4_X86_Page_Map * in: Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_2: * The signature for the underlying function is: * int seL4_X86_Page_Map(seL4_X86_Page service, seL4_X86_PageDirectory pd, seL4_Word vaddr, seL4_CapRights rights, seL4_X86_VMAttributes attr) * @param service Capability to the page to map. * @param pd Capability to the VSpace which will contain the mapping. * @param vaddr Virtual address to map the page into. * @param rights Rights for the mapping. * @param attr VM Attributes for the mapping. * @return 0 on success. * * Note: this function is generated during build. It is generated from the following definition: * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_2: * You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf * * hint 2: for the rights, use seL4_AllRights * hint 3: for VM attributes use seL4_ARCH_Default_VMAttributes * Hint 4: It is normal for this function call to fail. That means there are * no page tables with free slots -- proceed to the next step where you'll * be led to allocate a new empty page table and map it into the VSpace, * before trying again. */ error = seL4_ARCH_Page_Map(ipc_frame_object.cptr, pd_cap, ipc_buffer_vaddr, seL4_AllRights, seL4_ARCH_Default_VMAttributes); if (error != 0) { /* TODO 3: create a page table */ /* hint: vka_alloc_page_table() * int vka_alloc_page_table(vka_t *vka, vka_object_t *result) * @param vka Pointer to vka interface. * @param result Structure for the PageTable object. This gets initialised. * @return 0 on success * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_3: */ vka_object_t pt_object; error = vka_alloc_page_table(&vka, &pt_object); ZF_LOGF_IFERR(error, "Failed to allocate new page table.\n"); /* TODO 4: map the page table */ /* hint 1: seL4_ARCH_PageTable_Map() * The *ARCH* versions of seL4 sys calls are abstractions over the architecture provided by libsel4utils * this one is defined as: * #define seL4_ARCH_PageTable_Map seL4_X86_PageTable_Map * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_4: * The signature for the underlying function is: * int seL4_X86_PageTable_Map(seL4_X86_PageTable service, seL4_X86_PageDirectory pd, seL4_Word vaddr, seL4_X86_VMAttributes attr) * @param service Capability to the page table to map. * @param pd Capability to the VSpace which will contain the mapping. * @param vaddr Virtual address to map the page table into. * @param rights Rights for the mapping. * @param attr VM Attributes for the mapping. * @return 0 on success. * * Note: this function is generated during build. It is generated from the following definition: * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_4: * You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf * * hint 2: for VM attributes use seL4_ARCH_Default_VMAttributes */ error = seL4_ARCH_PageTable_Map(pt_object.cptr, pd_cap, ipc_buffer_vaddr, seL4_ARCH_Default_VMAttributes); ZF_LOGF_IFERR(error, "Failed to map page table into VSpace.\n" "\tWe are inserting a new page table into the top-level table.\n" "\tPass a capability to the new page table, and not for example, the IPC buffer frame vaddr.\n") /* TODO 5: then map the frame in */ /* hint 1: use seL4_ARCH_Page_Map() as above * hint 2: for the rights, use seL4_AllRights * hint 3: for VM attributes use seL4_ARCH_Default_VMAttributes */ error = seL4_ARCH_Page_Map(ipc_frame_object.cptr, pd_cap, ipc_buffer_vaddr, seL4_AllRights, seL4_ARCH_Default_VMAttributes); ZF_LOGF_IFERR(error, "Failed again to map the IPC buffer frame into the VSpace.\n" "\t(It's not supposed to fail.)\n" "\tPass a capability to the IPC buffer's physical frame.\n" "\tRevisit the first seL4_ARCH_Page_Map call above and double-check your arguments.\n"); } /* set the IPC buffer's virtual address in a field of the IPC buffer */ seL4_IPCBuffer *ipcbuf = (seL4_IPCBuffer*)ipc_buffer_vaddr; ipcbuf->userData = ipc_buffer_vaddr; /* TODO 6: create an endpoint */ /* hint: vka_alloc_endpoint() * int vka_alloc_endpoint(vka_t *vka, vka_object_t *result) * @param vka Pointer to vka interface. * @param result Structure for the Endpoint object. This gets initialised. * @return 0 on success * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_6: */ error = vka_alloc_endpoint(&vka, &ep_object); ZF_LOGF_IFERR(error, "Failed to allocate new endpoint object.\n"); /* TODO 7: make a badged copy of it in our cspace. This copy will be used to send * an IPC message to the original cap */ /* hint 1: vka_mint_object() * int vka_mint_object(vka_t *vka, vka_object_t *object, cspacepath_t *result, seL4_CapRights rights, seL4_CapData_t badge) * @param[in] vka The allocator for the cspace. * @param[in] object Target object for cap minting. * @param[out] result Allocated cspacepath. * @param[in] rights The rights for the minted cap. * @param[in] badge The badge for the minted cap. * @return 0 on success * * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_7: * * hint 2: for the rights, use seL4_AllRights * hint 3: for the badge use seL4_CapData_Badge_new() * seL4_CapData_t CONST seL4_CapData_Badge_new(seL4_Uint32 Badge) * @param[in] Badge The badge number to use * @return A CapData structure containing the desired badge info * * seL4_CapData_t is generated during build. * The type definition and generated field access functions are defined in a generated file: * build/x86/pc99/libsel4/include/sel4/types_gen.h * It is generated from the following definition: * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_7: * You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf * * hint 4: for the badge use EP_BADGE */ error = vka_mint_object(&vka, &ep_object, &ep_cap_path, seL4_AllRights, seL4_CapData_Badge_new(EP_BADGE)); ZF_LOGF_IFERR(error, "Failed to mint new badged copy of IPC endpoint.\n" "\tseL4_Mint is the backend for vka_mint_object.\n" "\tseL4_Mint is simply being used here to create a badged copy of the same IPC endpoint.\n" "\tThink of a badge in this case as an IPC context cookie.\n"); /* initialise the new TCB */ error = seL4_TCB_Configure(tcb_object.cptr, seL4_CapNull, seL4_PrioProps_new(seL4_MaxPrio, seL4_MaxPrio), cspace_cap, seL4_NilData, pd_cap, seL4_NilData, ipc_buffer_vaddr, ipc_frame_object.cptr); ZF_LOGF_IFERR(error, "Failed to configure the new TCB object.\n" "\tWe're running the new thread with the root thread's CSpace.\n" "\tWe're running the new thread in the root thread's VSpace.\n"); /* give the new thread a name */ name_thread(tcb_object.cptr, "hello-3: thread_2"); /* set start up registers for the new thread */ seL4_UserContext regs = {0}; size_t regs_size = sizeof(seL4_UserContext) / sizeof(seL4_Word); /* set instruction pointer where the thread shoud start running */ sel4utils_set_instruction_pointer(®s, (seL4_Word)thread_2); /* check that stack is aligned correctly */ const int stack_alignment_requirement = sizeof(seL4_Word) * 2; uintptr_t thread_2_stack_top = (uintptr_t)thread_2_stack + sizeof(thread_2_stack); ZF_LOGF_IF(thread_2_stack_top % (stack_alignment_requirement) != 0, "Stack top isn't aligned correctly to a %dB boundary.\n" "\tDouble check to ensure you're not trampling.", stack_alignment_requirement); /* set stack pointer for the new thread. remember the stack grows down */ sel4utils_set_stack_pointer(®s, thread_2_stack_top); /* set the fs register for IPC buffer */ regs.fs = IPCBUF_GDT_SELECTOR; /* actually write the TCB registers. */ error = seL4_TCB_WriteRegisters(tcb_object.cptr, 0, 0, regs_size, ®s); ZF_LOGF_IFERR(error, "Failed to write the new thread's register set.\n" "\tDid you write the correct number of registers? See arg4.\n"); /* start the new thread running */ error = seL4_TCB_Resume(tcb_object.cptr); ZF_LOGF_IFERR(error, "Failed to start new thread.\n"); /* we are done, say hello */ printf("main: hello world\n"); /* * now send a message to the new thread, and wait for a reply */ seL4_Word msg; seL4_MessageInfo_t tag; /* TODO 8: set the data to send. We send it in the first message register */ /* hint 1: seL4_MessageInfo_new() * seL4_MessageInfo_t CONST seL4_MessageInfo_new(seL4_Uint32 label, seL4_Uint32 capsUnwrapped, seL4_Uint32 extraCaps, seL4_Uint32 length) * @param label The value of the label field * @param capsUnwrapped The value of the capsUnwrapped field * @param extraCaps The value of the extraCaps field * @param length The number of message registers to send * @return The seL4_MessageInfo_t containing the given values. * * seL4_MessageInfo_new() is generated during build. It can be found in: * build/x86/pc99/libsel4/include/sel4/types_gen.h * It is generated from the following definition: * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_8: * * hint 2: use 0 for the first 3 fields. * hint 3: send only 1 message register of data * * hint 4: seL4_SetMR() * void seL4_SetMR(int i, seL4_Word mr) * @param i The message register to write * @param mr The value of the message register * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_8: * You can find out more about message registers in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf * * hint 5: send MSG_DATA */ tag = seL4_MessageInfo_new(0, 0, 0, 1); seL4_SetMR(0, MSG_DATA); /* TODO 9: send and wait for a reply. */ /* hint: seL4_Call() * seL4_MessageInfo_t seL4_Call(seL4_CPtr dest, seL4_MessageInfo_t msgInfo) * @param dest The capability to be invoked. * @param msgInfo The messageinfo structure for the IPC. This specifies information about the message to send (such as the number of message registers to send). * @return A seL4_MessageInfo_t structure. This is information about the repy message. * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_9: * You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf * * hint 2: seL4_MessageInfo_t is generated during build. * The type definition and generated field access functions are defined in a generated file: * build/x86/pc99/libsel4/include/sel4/types_gen.h * It is generated from the following definition: * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_9: * You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf */ tag = seL4_Call(ep_cap_path.capPtr, tag); /* TODO 10: get the reply message */ /* hint: seL4_GetMR() * seL4_Word seL4_GetMR(int i) * @param i The message register to retreive * @return The message register value * Link to source: https://wiki.sel4.systems/seL4%20Tutorial%203#TODO_10: * You can find out more about message registers in the API manual: http://sel4.systems/Info/Docs/seL4-manual-3.0.0.pdf */ msg = seL4_GetMR(0); /* check that we got the expected repy */ ZF_LOGF_IF(seL4_MessageInfo_get_length(tag) != 1, "Response data from thread_2 was not the length expected.\n" "\tHow many registers did you set with seL4_SetMR within thread_2?\n"); ZF_LOGF_IF(msg != ~MSG_DATA, "Response data from thread_2's content was not what was expected.\n"); printf("main: got a reply: %#x\n", msg); return 0; }
int main(void) { UNUSED int error; /* give us a name: useful for debugging if the thread faults */ name_thread(seL4_CapInitThreadTCB, "hello-3"); /* get boot info */ info = seL4_GetBootInfo(); /* init simple */ simple_default_init_bootinfo(&simple, info); /* print out bootinfo and other info about simple */ simple_print(&simple); /* create an allocator */ allocman = bootstrap_use_current_simple(&simple, ALLOCATOR_STATIC_POOL_SIZE, allocator_mem_pool); assert(allocman); /* create a vka (interface for interacting with the underlying allocator) */ allocman_make_vka(&vka, allocman); /* get our cspace root cnode */ seL4_CPtr cspace_cap; cspace_cap = simple_get_cnode(&simple); /* get our vspace root page directory */ seL4_CPtr pd_cap; pd_cap = simple_get_pd(&simple); /* create a new TCB */ vka_object_t tcb_object = {0}; error = vka_alloc_tcb(&vka, &tcb_object); assert(error == 0); /* * create and map an ipc buffer: */ /* TODO 1: get a frame cap for the ipc buffer */ /* hint: vka_alloc_frame() * int vka_alloc_frame(vka_t *vka, uint32_t size_bits, vka_object_t *result) * @param vka Pointer to vka interface. * @param size_bits Frame size: 2^size_bits * @param result Structure for the Frame object. This gets initialised. * @return 0 on success * https://github.com/seL4/libsel4vka/blob/master/include/vka/object.h#L147 */ vka_object_t ipc_frame_object; error = vka_alloc_frame(&vka, IPCBUF_FRAME_SIZE_BITS, &ipc_frame_object); assert(error == 0); /* * map the frame into the vspace at ipc_buffer_vaddr. * To do this we first try to map it in to the root page directory. * If there is already a page table mapped in the appropriate slot in the * page diretory where we can insert this frame, then this will succeed. * Otherwise we first need to create a page table, and map it in to * the page directory, before we can map the frame in. */ seL4_Word ipc_buffer_vaddr = IPCBUF_VADDR; /* TODO 2: try to map the frame the first time */ /* hint 1: seL4_ARCH_Page_Map() * The *ARCH* versions of seL4 sys calls are abstractions over the architecture provided by libsel4utils * this one is defined as: * #define seL4_ARCH_Page_Map seL4_IA32_Page_Map * in: https://github.com/seL4/libsel4utils/blob/master/include/sel4utils/mapping.h#L69 * The signature for the underlying function is: * int seL4_IA32_Page_Map(seL4_IA32_Page service, seL4_IA32_PageDirectory pd, seL4_Word vaddr, seL4_CapRights rights, seL4_IA32_VMAttributes attr) * @param service Capability to the page to map. * @param pd Capability to the VSpace which will contain the mapping. * @param vaddr Virtual address to map the page into. * @param rights Rights for the mapping. * @param attr VM Attributes for the mapping. * @return 0 on success. * * Note: this function is generated during build. It is generated from the following definition: * https://github.com/seL4/seL4/blob/master/libsel4/arch_include/x86/interfaces/sel4arch.xml#L52 * You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf * * hint 2: for the rights, use seL4_AllRights * hint 3: for VM attributes use seL4_ARCH_Default_VMAttributes */ error = seL4_ARCH_Page_Map(ipc_frame_object.cptr, pd_cap, ipc_buffer_vaddr, seL4_AllRights, seL4_ARCH_Default_VMAttributes); if (error != 0) { /* TODO 3: create a page table */ /* hint: vka_alloc_page_table() * int vka_alloc_page_table(vka_t *vka, vka_object_t *result) * @param vka Pointer to vka interface. * @param result Structure for the PageTable object. This gets initialised. * @return 0 on success * https://github.com/seL4/libsel4vka/blob/master/include/vka/object.h#L178 */ vka_object_t pt_object; error = vka_alloc_page_table(&vka, &pt_object); assert(error == 0); /* TODO 4: map the page table */ /* hint 1: seL4_ARCH_PageTable_Map() * The *ARCH* versions of seL4 sys calls are abstractions over the architecture provided by libsel4utils * this one is defined as: * #define seL4_ARCH_PageTable_Map seL4_IA32_PageTable_Map * in: https://github.com/seL4/libsel4utils/blob/master/include/sel4utils/mapping.h#L73 * The signature for the underlying function is: * int seL4_IA32_PageTable_Map(seL4_IA32_PageTable service, seL4_IA32_PageDirectory pd, seL4_Word vaddr, seL4_IA32_VMAttributes attr) * @param service Capability to the page table to map. * @param pd Capability to the VSpace which will contain the mapping. * @param vaddr Virtual address to map the page table into. * @param rights Rights for the mapping. * @param attr VM Attributes for the mapping. * @return 0 on success. * * Note: this function is generated during build. It is generated from the following definition: * https://github.com/seL4/seL4/blob/master/libsel4/arch_include/x86/interfaces/sel4arch.xml#L37 * You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf * * hint 2: for VM attributes use seL4_ARCH_Default_VMAttributes */ error = seL4_ARCH_PageTable_Map(pt_object.cptr, pd_cap, ipc_buffer_vaddr, seL4_ARCH_Default_VMAttributes); assert(error == 0); /* TODO 5: then map the frame in */ /* hint 1: use seL4_ARCH_Page_Map() as above * hint 2: for the rights, use seL4_AllRights * hint 3: for VM attributes use seL4_ARCH_Default_VMAttributes */ error = seL4_ARCH_Page_Map(ipc_frame_object.cptr, pd_cap, ipc_buffer_vaddr, seL4_AllRights, seL4_ARCH_Default_VMAttributes); assert(error == 0); } /* set the IPC buffer's virtual address in a field of the IPC buffer */ seL4_IPCBuffer *ipcbuf = (seL4_IPCBuffer*)ipc_buffer_vaddr; ipcbuf->userData = ipc_buffer_vaddr; /* TODO 6: create an endpoint */ /* hint: vka_alloc_endpoint() * int vka_alloc_endpoint(vka_t *vka, vka_object_t *result) * @param vka Pointer to vka interface. * @param result Structure for the Endpoint object. This gets initialised. * @return 0 on success * https://github.com/seL4/libsel4vka/blob/master/include/vka/object.h#L94 */ error = vka_alloc_endpoint(&vka, &ep_object); assert(error == 0); /* TODO 7: make a badged copy of it in our cspace. This copy will be used to send * an IPC message to the original cap */ /* hint 1: vka_mint_object() * int vka_mint_object(vka_t *vka, vka_object_t *object, cspacepath_t *result, seL4_CapRights rights, seL4_CapData_t badge) * @param[in] vka The allocator for the cspace. * @param[in] object Target object for cap minting. * @param[out] result Allocated cspacepath. * @param[in] rights The rights for the minted cap. * @param[in] badge The badge for the minted cap. * @return 0 on success * * https://github.com/seL4/libsel4vka/blob/master/include/vka/object_capops.h#L41 * * hint 2: for the rights, use seL4_AllRights * hint 3: for the badge use seL4_CapData_Badge_new() * seL4_CapData_t CONST seL4_CapData_Badge_new(seL4_Uint32 Badge) * @param[in] Badge The badge number to use * @return A CapData structure containing the desired badge info * * seL4_CapData_t is generated during build. * The type definition and generated field access functions are defined in a generated file: * build/x86/pc99/libsel4/include/sel4/types_gen.h * It is generated from the following definition: * https://github.com/seL4/seL4/blob/master/libsel4/include/sel4/types.bf#L30 * You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf * * hint 4: for the badge use EP_BADGE */ error = vka_mint_object(&vka, &ep_object, &ep_cap_path, seL4_AllRights, seL4_CapData_Badge_new(EP_BADGE)); assert(error == 0); /* initialise the new TCB */ error = seL4_TCB_Configure(tcb_object.cptr, seL4_CapNull, seL4_MaxPrio, cspace_cap, seL4_NilData, pd_cap, seL4_NilData, ipc_buffer_vaddr, ipc_frame_object.cptr); assert(error == 0); /* give the new thread a name */ name_thread(tcb_object.cptr, "hello-3: thread_2"); /* set start up registers for the new thread */ seL4_UserContext regs = {0}; size_t regs_size = sizeof(seL4_UserContext) / sizeof(seL4_Word); /* set instruction pointer where the thread shoud start running */ sel4utils_set_instruction_pointer(®s, (seL4_Word)thread_2); /* check that stack is aligned correctly */ uintptr_t thread_2_stack_top = (uintptr_t)thread_2_stack + sizeof(thread_2_stack); assert(thread_2_stack_top % (sizeof(seL4_Word) * 2) == 0); /* set stack pointer for the new thread. remember the stack grows down */ sel4utils_set_stack_pointer(®s, thread_2_stack_top); /* set the gs register for thread local storage */ regs.gs = IPCBUF_GDT_SELECTOR; /* actually write the TCB registers. */ error = seL4_TCB_WriteRegisters(tcb_object.cptr, 0, 0, regs_size, ®s); assert(error == 0); /* start the new thread running */ error = seL4_TCB_Resume(tcb_object.cptr); assert(error == 0); /* we are done, say hello */ printf("main: hello world\n"); /* * now send a message to the new thread, and wait for a reply */ seL4_Word msg; seL4_MessageInfo_t tag; /* TODO 8: set the data to send. We send it in the first message register */ /* hint 1: seL4_MessageInfo_new() * seL4_MessageInfo_t CONST seL4_MessageInfo_new(seL4_Uint32 label, seL4_Uint32 capsUnwrapped, seL4_Uint32 extraCaps, seL4_Uint32 length) * @param label The value of the label field * @param capsUnwrapped The value of the capsUnwrapped field * @param extraCaps The value of the extraCaps field * @param length The number of message registers to send * @return The seL4_MessageInfo_t containing the given values. * * seL4_MessageInfo_new() is generated during build. It can be found in: * build/x86/pc99/libsel4/include/sel4/types_gen.h * It is generated from the following definition: * https://github.com/seL4/seL4/blob/master/libsel4/include/sel4/types.bf#L35 * * hint 2: use 0 for the first 3 fields. * hint 3: send only 1 message register of data * * hint 4: seL4_SetMR() * void seL4_SetMR(int i, seL4_Word mr) * @param i The message register to write * @param mr The value of the message register * https://github.com/seL4/seL4/blob/master/libsel4/arch_include/x86/sel4/arch/functions.h#L41 * You can find out more about message registers in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf * * hint 5: send MSG_DATA */ tag = seL4_MessageInfo_new(0, 0, 0, 1); seL4_SetMR(0, MSG_DATA); /* TODO 9: send and wait for a reply. */ /* hint: seL4_Call() * seL4_MessageInfo_t seL4_Call(seL4_CPtr dest, seL4_MessageInfo_t msgInfo) * @param dest The capability to be invoked. * @param msgInfo The messageinfo structure for the IPC. This specifies information about the message to send (such as the number of message registers to send). * @return A seL4_MessageInfo_t structure. This is information about the repy message. * https://github.com/seL4/seL4/blob/master/libsel4/arch_include/x86/sel4/arch/syscalls.h#L242 * You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf * * hint 2: seL4_MessageInfo_t is generated during build. * The type definition and generated field access functions are defined in a generated file: * build/x86/pc99/libsel4/include/sel4/types_gen.h * It is generated from the following definition: * https://github.com/seL4/seL4/blob/master/libsel4/include/sel4/types.bf#L35 * You can find out more about it in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf */ tag = seL4_Call(ep_cap_path.capPtr, tag); /* TODO 10: get the reply message */ /* hint: seL4_GetMR() * seL4_Word seL4_GetMR(int i) * @param i The message register to retreive * @return The message register value * https://github.com/seL4/seL4/blob/master/libsel4/arch_include/x86/sel4/arch/functions.h#L33 * You can find out more about message registers in the API manual: http://sel4.systems/Info/Docs/seL4-manual.pdf */ msg = seL4_GetMR(0); /* check that we got the expected repy */ assert(seL4_MessageInfo_get_length(tag) == 1); assert(msg == ~MSG_DATA); printf("main: got a reply: %#x\n", msg); return 0; }
int main(void) { UNUSED int error; /* give us a name: useful for debugging if the thread faults */ name_thread(seL4_CapInitThreadTCB, "hello-2"); /* get boot info */ info = seL4_GetBootInfo(); /* init simple */ simple_default_init_bootinfo(&simple, info); /* print out bootinfo and other info about simple */ simple_print(&simple); /* create an allocator */ allocman = bootstrap_use_current_simple(&simple, ALLOCATOR_STATIC_POOL_SIZE, allocator_mem_pool); assert(allocman); /* create a vka (interface for interacting with the underlying allocator) */ allocman_make_vka(&vka, allocman); /* get our cspace root cnode */ seL4_CPtr cspace_cap; cspace_cap = simple_get_cnode(&simple); /* get our vspace root page diretory */ seL4_CPtr pd_cap; pd_cap = simple_get_pd(&simple); /* create a new TCB */ vka_object_t tcb_object = {0}; error = vka_alloc_tcb(&vka, &tcb_object); assert(error == 0); /* initialise the new TCB */ error = seL4_TCB_Configure(tcb_object.cptr, seL4_CapNull, seL4_MaxPrio, cspace_cap, seL4_NilData, pd_cap, seL4_NilData, 0, 0); assert(error == 0); /* give the new thread a name */ name_thread(tcb_object.cptr, "hello-2: thread_2"); /* set start up registers for the new thread: */ seL4_UserContext regs = {0}; /* set instruction pointer where the thread shoud start running */ sel4utils_set_instruction_pointer(®s, (seL4_Word)thread_2); /* check that stack is aligned correctly */ uintptr_t thread_2_stack_top = (uintptr_t)thread_2_stack + sizeof(thread_2_stack); assert(thread_2_stack_top % (sizeof(seL4_Word) * 2) == 0); /* set stack pointer for the new thread. remember the stack grows down */ sel4utils_set_stack_pointer(®s, thread_2_stack_top); /* actually write the TCB registers. we write 2 registers: * instruction pointer is first, stack pointer is second. */ error = seL4_TCB_WriteRegisters(tcb_object.cptr, 0, 0, 2, ®s); assert(error == 0); /* start the new thread running */ error = seL4_TCB_Resume(tcb_object.cptr); assert(error == 0); /* we are done, say hello */ printf("main: hello world\n"); return 0; }
static int vmm_init(void) { vka_object_t fault_ep_obj; vka_t* vka; simple_t* simple; vspace_t* vspace; int err; vka = &_vka; vspace = &_vspace; simple = &_simple; fault_ep_obj.cptr = 0; /* Camkes adds nothing to our address space, so this array is empty */ void *existing_frames[] = { NULL }; camkes_make_simple(simple); start_extra_frame_caps = simple_last_valid_cap(simple) + 1; /* Initialize allocator */ allocman = bootstrap_use_current_1level( simple_get_cnode(simple), simple_get_cnode_size_bits(simple), simple_last_valid_cap(simple) + 1 + num_extra_frame_caps, BIT(simple_get_cnode_size_bits(simple)), sizeof(allocator_mempool), allocator_mempool ); assert(allocman); err = allocman_add_simple_untypeds(allocman, simple); assert(!err); allocman_make_vka(vka, allocman); /* Initialize the vspace */ err = sel4utils_bootstrap_vspace(vspace, &_alloc_data, simple_get_init_cap(simple, seL4_CapInitThreadPD), vka, NULL, NULL, existing_frames); assert(!err); /* Initialise device support */ err = sel4platsupport_new_io_mapper(*simple, *vspace, *vka, &_io_ops.io_mapper); assert(!err); /* Initialise MUX subsystem */ err = mux_sys_init(&_io_ops, &_io_ops.mux_sys); assert(!err); /* Initialise DMA */ err = dma_dmaman_init(&_dma_morecore, NULL, &_io_ops.dma_manager); assert(!err); /* Allocate an endpoint for listening to events */ err = vka_alloc_endpoint(vka, &fault_ep_obj); assert(!err); _fault_endpoint = fault_ep_obj.cptr; /* Create an IRQ server */ err = irq_server_new(vspace, vka, simple_get_cnode(simple), IRQSERVER_PRIO, simple, fault_ep_obj.cptr, IRQ_MESSAGE_LABEL, 256, &_irq_server); assert(!err); return 0; }