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1. 发明授权

US5940871A Computer system and method for selectively decompressing operating system ROM image code using a page fault 失效
标题翻译：使用页面错误选择性地解压缩操作系统ROM映像代码的计算机系统和方法
公开(公告)号：US5940871A
公开(公告)日：1999-08-17
申请号：US739228
申请日：1996-10-28
申请人： Prabhakar Goyal , Grama Kasturi Harish , James Darrell Heath , Chakravarthy Jagannadhan , Vishwanath Venkataramappa
发明人： Prabhakar Goyal , Grama Kasturi Harish , James Darrell Heath , Chakravarthy Jagannadhan , Vishwanath Venkataramappa
IPC分类号： G06F9/318 , G06F9/38 , G06F12/08 , G06F12/10 , G06F5/00 , G06F13/00
CPC分类号： G06F9/30178 , G06F12/08 , G06F9/3017 , G06F9/3861 , G06F9/4401 , G06F2212/401
摘要： A system and method for compressing portions of the operating system in a ROM image and for executing the system from the compressed image. Compression is used to reduce the size of the ROM image to reduce component cost. Low use segments are compressed. The operating system is initialized into a virtual address space with entries only for the uncompressed segments. Attempts to execute a compressed segment result in a page fault. The page fault handler determines that the segment is compressed, allocates a new page and decompresses the page into RAM for execution. The RAM copy of the segment is used for execution until the page is reused for another purpose. Later execution causes a new page fault and reallocation.A memory object reference is created for components of the image; a virtual memory page reference is then made for each component not in a compressed form; instructions are then executed by reference to the image; a page fault is detected when attempting to execute an instruction in a component not having a page table reference; a compressed image is then decompressed into the random access memory in response to the page fault.
摘要翻译：一种用于压缩ROM图像中的操作系统的部分并且用于从压缩图像执行系统的系统和方法。压缩用于减小ROM映像的大小以降低组件成本。低使用段被压缩。操作系统被初始化为一个虚拟地址空间，只有未压缩段的条目。尝试执行压缩段会导致页面错误。页面错误处理程序确定段被压缩，分配一个新页面并将页面解压缩到RAM中以供执行。段的RAM副本用于执行，直到页面被重用为另一目的。后来执行会导致新的页面错误和重新分配。为图像的组件创建记忆对象引用; 然后针对不是压缩形式的每个组件进行虚拟内存页面引用; 然后通过参考图像执行指令; 当在不具有页表引用的组件中执行指令时，检测到页错误; 然后将压缩图像解压缩到随机存取存储器中以响应页面错误。

2. 发明授权

US06363436B1 Method and system for loading libraries into embedded systems 失效
标题翻译：将库加载到嵌入式系统中的方法和系统
公开(公告)号：US06363436B1
公开(公告)日：2002-03-26
申请号：US08791446
申请日：1997-01-27
申请人： Lee Emison Hagy , Grama Kasturi Harish , James Darrell Heath , Chakravarthy Jagannadhan , Deepak Anantarao Kulkarni
发明人： Lee Emison Hagy , Grama Kasturi Harish , James Darrell Heath , Chakravarthy Jagannadhan , Deepak Anantarao Kulkarni
IPC分类号： G06F9445
CPC分类号： G06F9/44521
摘要： A method and means for enhancing an embedded system includes a technique for generating shared library information which is stored in the ROM, the shared library information including pointers to structures for each shared library to be preloaded into the ROM, maintaining each module per library as a linked list. When the ROM image is generated, the tool writes the structures describing the preloaded libraries into the ROM image. As pointers to the structures are not valid in the ROM image, the pointers to these modules are relocated so that they are valid in the loader's address space when remapped into the loader by the kernel. At system start-up or “boot,” the kernel starts the embedded loader and maps the structures exactly where the loader expects to find them. Thus, when the loader attempts to load an external dynamically linked ELF executable file that is linked to one of the shared libraries in the ROM, the loader resolves all references to the preloaded library by traversing the structures provided that were mapped into its address space by the system kernel.
摘要翻译：一种用于增强嵌入式系统的方法和装置包括一种用于产生存储在ROM中的共享库信息的技术，共享库信息包括指向每个库预先加载到ROM中的每个共享库的结构的指针，将每个库的每个模块保持为链表。当ROM映像生成时，工具将描述预加载库的结构写入ROM映像。由于指向结构的指针在ROM映像中无效，因此重定位到这些模块的指针，以便在内核将其重新映射到加载程序时，它们在加载程序的地址空间中有效。在系统启动或“启动”时，内核启动嵌入式加载程序，并将结构映射到装载程序期望找到它们的位置。因此，当加载程序尝试加载链接到ROM中的一个共享库的外部动态链接的ELF可执行文件时，加载程序通过遍历提供的映射到其地址空间中的结构来解析对预加载库的所有引用，系统内核。

3. 发明授权

US5940850A System and method for selectively enabling load-on-write of dynamic ROM data to RAM 失效
标题翻译：用于选择性地将动态ROM数据写入RAM的系统和方法
公开(公告)号：US5940850A
公开(公告)日：1999-08-17
申请号：US742108
申请日：1996-10-31
申请人： Grama Kasturi Harish , James Darrell Heath , Vishwanath Venkataramappa
发明人： Grama Kasturi Harish , James Darrell Heath , Vishwanath Venkataramappa
IPC分类号： G06F12/06 , G06F12/10 , G06F13/00
CPC分类号： G06F12/0638
摘要： A system and method for loading dynamic data stored in read-only memory (ROM) is loaded into random access memory (RAM) only when it is being modified. Unmodified dynamic data is used from ROM saving valuable RAM space. Virtual memory page table entries are created for all dynamic data with the physical reference pointing to the dynamic data in ROM. Page table entries in a translation table for dynamic data in ROM include a virtual address to physical address mapping and are marked read-only causing a write-access exception if an attempt is made to write to or update the dynamic data. Write-access exceptions are intercepted, and a write-access exception caused by an attempt to write to dynamic data in ROM causes the system to allocate a dynamic data page in RAM, copy the ROM data to the RAM, update the page table entry to point to the RAM page rather than the ROM page, and finally to update the dynamic data now present in read-write RAM.
摘要翻译：存储在只读存储器（ROM）中的加载动态数据的系统和方法仅在其被修改时被加载到随机存取存储器（RAM）中。 ROM中使用未修改的动态数据，节省宝贵的RAM空间。为所有动态数据创建虚拟内存页表项，物理引用指向ROM中的动态数据。用于ROM中动态数据的转换表中的页表条目包括物理地址映射的虚拟地址，如果尝试写入或更新动态数据，则标记为只读，导致写入访问异常。写入访问异常被拦截，并且由于写入到ROM中的动态数据而引起的写访问异常导致系统在RAM中分配动态数据页，将ROM数据复制到RAM，将页表条目更新为指向RAM页面而不是ROM页面，最后更新现在存在于读写RAM中的动态数据。

4. 发明授权

US5802549A Method and apparatus for patching pages of ROM 失效
标题翻译：用于修补ROM页面的方法和装置
公开(公告)号：US5802549A
公开(公告)日：1998-09-01
申请号：US572694
申请日：1995-12-14
申请人： Prabhakar Goyal , Grama Kasturi Harish , James Darrell Heath
发明人： Prabhakar Goyal , Grama Kasturi Harish , James Darrell Heath
IPC分类号： G06F9/445 , G06F12/06 , G06F12/02
CPC分类号： G06F12/0638 , G06F8/66
摘要： A method and apparatus for patching ROM pages using minimal RAM pages is accomplished by reserving a limited number of RAM pages which are shared to facilitate a patching process. The patching process begins when a flagged page of ROM (i.e., a page that is to be patched) is copied into one of the reserved pages of RAM. Having copied the flagged page, a patch file is accessed to retrieve updated code and outdated code of the flagged page. The process overwrites the outdated code with the updated code to produce a patched code. The patched code is read by a processor and is subsequently overwritten by another patched code that represents another flagged page of ROM.
摘要翻译：使用最小RAM页面来修补ROM页面的方法和装置是通过保留有限数量的RAM页面来实现的，这些RAM页面被共享以便于修补过程。当将标记的ROM页面（即，要修补的页面）复制到RAM的保留页面之一时，修补过程开始。复制标记的页面后，可以访问补丁文件，以检索已更新的代码和过时的已标记页面的代码。该过程将使用更新的代码覆盖过时的代码，以生成修补代码。修补的代码由处理器读取，并且随后被代表ROM的另一标记页面的另一个修补代码覆盖。

5. 发明授权

US6052778A Embedded system having dynamically linked dynamic loader and method for linking dynamic loader shared libraries and application programs 失效
标题翻译：嵌入式系统具有动态链接的动态加载器和方法，用于链接动态加载器共享库和应用程序
公开(公告)号：US6052778A
公开(公告)日：2000-04-18
申请号：US782724
申请日：1997-01-13
申请人： Lee Emison Hagy , Grama Kasturi Harish , James Darrell Heath , Deepak Anantarao Kulkarni , William Francis Quinn
发明人： Lee Emison Hagy , Grama Kasturi Harish , James Darrell Heath , Deepak Anantarao Kulkarni , William Francis Quinn
IPC分类号： G06F9/445
CPC分类号： G06F9/44521
摘要： A method and means for enhancing an embedded system includes means for and steps of executing a boot routine; activating a ROM loader routine; initializing an I/O subsystem; activating an embedded OS; creating a dynamically linked embedded system loader task, and having the embedded OS map the Global Coerced Memory (GCM) and the Global Shared Memory (GSM) into its address space so that it can access shared libraries; loading each of a plurality of executable programs, and mapping the GCM and the GSM into each executable program's address space so it is able to access shared libraries.
摘要翻译：一种用于增强嵌入式系统的方法和装置，包括执行引导例程的步骤和步骤; 激活ROM加载程序; 初始化I / O子系统; 激活嵌入式操作系统; 创建动态链接的嵌入式系统加载器任务，并使嵌入式操作系统将全局强制内存（GCM）和全局共享内存（GSM）映射到其地址空间中，以便它可以访问共享库; 加载多个可执行程序中的每一个，并将GCM和GSM映射到每个可执行程序的地址空间，以便能够访问共享库。

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